Free AI Micro-Tools

100 small, fast utilities for everyday work with AI: prompt builders and analyzers, token counters, price and capacity calculators, evaluation helpers, data converters, and developer utilities. Everything runs 100% in your browser, no signup, no data sent anywhere.

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Looking for the 108 On-Device AI Tools? They have their own page

Writers, summarizers, translators, study aids, and text analyzers powered by a real language model running on your own GPU. Nothing is ever uploaded.

On-Device AI → 🤖

New: watch 5 AI agents work together, live

The Multi-Agent Lab runs a Planner, a Librarian, a Curriculum Architect, a Quiz Master, and a Reviewer on your own GPU. They hand work to each other, search the real course catalog, and catch each other inventing courses.

Multi-Agent Lab →

⭐ Start Here

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Prompt Analyzer

Score any prompt 0-100 and get specific fixes plus a rewritten structure.

Use it when an LLM keeps giving you vague answers → 🎯

Model Picker Wizard

Six quick questions, then a model tier recommendation with the reasoning.

Use it when you're unsure which model to start with → 📊

Model Comparison Table

Claude, GPT, and Gemini side by side: context, pricing, speed, best-for.

Use it when choosing which LLM fits a task or budget → 📚

AI Glossary

Plain-English definitions for 85+ AI terms, with instant search and A-Z jumps.

Use it when a doc or meeting throws jargon at you →

Prompting 5

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Prompt Analyzer

Paste a prompt and get a 0-100 quality score with specific, actionable fixes and a rewritten prompt structure.

Use it when an LLM keeps giving you vague answers → 📊

Prompt Diff

Compare two prompts or two model outputs side by side with word-level highlighting and a similarity score.

Use it when iterating on prompt versions → 🛡

Prompt Injection Tester

Score your system prompt against common injection patterns and get prioritized hardening suggestions.

Use it before shipping any AI feature with user input → 📚

Prompt Library

30+ battle-tested prompt templates for work: writing, coding, analysis, business. Fill in the blanks and copy.

Use it when you need a great prompt fast → 🧠

System Prompt Generator

Pick a role, tone, format, and guardrails; get a clean, well-structured system prompt with every section explained.

Use it when starting any new AI assistant or agent →

Building & APIs 5

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API Request Builder

Fill a form and get ready-to-run curl, Python, and JavaScript code for Claude and OpenAI API calls.

Use it for your first API call or a quick scaffold → 🧩

JSON Schema Builder

Visually define fields and get JSON Schema, Claude tool definitions, and OpenAI function definitions in one click.

Use it when wiring up structured output or tool use → 📋

JSONL Validator

Validate and fix fine-tuning datasets line by line, convert between formats, and estimate total training tokens.

Use it before submitting a fine-tuning job → 🛠

LLM JSON Repairer

Paste broken JSON from any model; get valid JSON back with every fix listed: fences, trailing commas, quotes, and more.

Use it when a model's JSON will not parse → 📝

LLM Output Formatter

Turn markdown chatbot output into clean rich text or HTML you can paste straight into Word, Gmail, or Docs.

Use it when sharing AI output with non-developers →

Costs & Capacity 16

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Agent Cost Simulator

Model multi-step agent runs with growing context and tool calls; compare cost per run and per month across models.

Use it before deploying agents at scale → 📈

AI ROI Calculator

Turn time saved and API costs into net monthly benefit, payback period, and 12-month ROI you can show your boss.

Use it to build the business case for automation → 📦

Batch API Savings Calculator

Compare realtime vs batch API cost for Claude models and a custom model from your monthly token volume, with the industry-standard 50% batch discount.

Use it when you have bulk, non-urgent LLM workloads and want to see what moving them to a batch API would save each month. → 📐

Context Budget Planner

Stack system prompt, history, RAG chunks, and tools against a model's context window and see what fits.

Use it when designing a chat or RAG app → 🗄️

Embedding Storage Calculator

Size a vector database from documents, chunks, dimensions, and dtype, with HNSW index overhead and approximate monthly hosting cost.

Use it when you are planning a RAG or semantic search build and need to budget vector storage before choosing a vector DB plan. → 🎯

Fine-Tuning Cost Calculator

Estimate training cost from dataset tokens and epochs, compare fine-tuned inference uplift vs the base model, and see break-even vs prompt engineering.

Use it when you are deciding whether fine-tuning a model will pay off compared to longer prompts or caching. → 🖥️

GPU Cloud Cost Comparator

Compare monthly rental cost for A100, H100, L4, and RTX 4090 GPUs from editable hourly rate ranges, usage hours, and GPU count.

Use it when you are weighing GPU rental options or deciding between renting GPUs and paying for API tokens. → 🖥

GPU VRAM Calculator

Model size + quantization + context = the VRAM you need, with a fits/doesn't-fit verdict for common GPUs and Macs.

Use it before downloading a local model → ⏱️

Latency Budget Calculator

Turn output tokens, tokens/sec, and time to first token into full response time, tokens visible at 1s/3s/10s, and a reading-speed comparison.

Use it when you are designing a streaming LLM experience and need to know how the response will feel to users. → 💰

LLM Price Calculator

Enter your input tokens, output tokens, and monthly request volume to see live monthly costs across Claude, GPT, and Gemini models.

Use it when budgeting or picking a model for a project → 🎯

Model Picker Wizard

Answer six quick questions about your task and get a model tier recommendation with the reasoning spelled out.

Use it when you're unsure which model to start with → ⚡

Prompt Caching Savings Calculator

Model cached prompt tokens, hit rate, read discount, and write premium to see your monthly bill with and without prompt caching, plus a verdict.

Use it when every request re-sends the same system prompt or context and you want to quantify what caching would save. → ⏳

Rate-Limit Planner

Map your workload against provider RPM/TPM limits and get concurrency, pacing, and queueing recommendations.

Use it before scaling up API traffic → 🔢

Token Counter

Paste any text and get a live estimate of tokens, words, characters, and what that input would cost on popular models.

Use it before sending long prompts to an LLM API → 🚀

Tokens Per Second Converter

Convert instantly between tok/s, tokens/min, words/min, chars/sec, and pages/hour, plus a solver for the aggregate throughput a workload needs.

Use it when you need to translate throughput specs between units or size the tok/s a given request load requires. → 🖼

Vision Cost Estimator

Drop in an image (never uploaded) and estimate vision input tokens and monthly cost from its dimensions.

Use it when adding image inputs to your app →

Evaluation & Decisions 7

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A/B Test Calculator

Sample size planner for prompt and model A/B tests plus a two-proportion z-test results checker with a plain-English verdict.

Use it when comparing two prompts or models and you want to know how many test cases you need, or whether a result is real. → 🧪

AI Readiness Quiz

10-question organizational AI readiness assessment scored out of 30 with a tier verdict, per-dimension bars, and prioritized next steps.

Use it when gauging whether your organization is actually ready to adopt AI and what to fix first. → ✂️

Dataset Splitter

Split JSONL or line-based data into train/val/test with a seeded shuffle, sum-to-100 sliders, optional stratification by key, and downloads.

Use it when preparing fine-tuning or eval datasets and you need clean, reproducible splits. → 🎯

Eval Confidence Intervals

Wilson score confidence intervals for eval accuracy with a visual range bar and a solver for how many more evals you need.

Use it when someone quotes an accuracy number and you want to know how much to trust it. → 📋

Eval Rubric Builder

Build a weighted evaluation rubric with 1-5 scale anchors, then export a markdown rubric and an LLM-as-judge prompt with a strict JSON scoring schema.

Use it when you need to grade LLM outputs consistently, by humans or by a judge model. → 📊

Model Comparison Table

Sortable side-by-side comparison of Claude, GPT, and Gemini models: context windows, pricing per 1M tokens, modality, speed, and best-for guidance.

Use it when choosing which LLM to use for a task or budget. → 🧭

RAG Decision Helper

Answer 6 questions about your data, queries, latency, budget, and team to get a live recommendation: no-RAG, simple RAG, hybrid, agentic, or fine-tuning.

Use it when planning an AI app and you are unsure whether you need RAG, and which architecture fits. →

Data & Safety 3

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PII Scrubber

Mask emails, phones, SSNs, cards, and IPs before pasting text into any AI tool. Runs fully on your device.

Use it before sharing real data with an LLM → 🪨

RAG Chunk Visualizer

Paste a document and see exactly how it splits into chunks with overlap highlighted, token counts, and embedding cost.

Use it when tuning chunk size for a RAG pipeline → 🧹

Text Cleaner

Strip HTML, boilerplate, page numbers, and noise from messy text before feeding it to an LLM or RAG index.

Use it on PDF copies and web text before ingestion →

Data & Converters 7

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CSV ↔ JSON Converter

Turn CSV into a JSON array of objects and back, with delimiter auto-detect, RFC 4180 quoting, a preview table, and downloads.

Use it when you need spreadsheet exports as JSON for an API, or JSON data as a CSV you can open in Excel. → 🧭

JSON Path Tester

Test paths like a.b[0].c with [*] wildcards against your JSON and click any node in the tree to get its exact path.

Use it when you are digging through a deep API response and need the precise path to a value for your code. → 📋

Markdown Table Generator

Build markdown tables in a click-to-edit grid, paste cells straight from a spreadsheet, set column alignment, and copy clean markdown.

Use it when you are writing README files, docs, or GitHub comments and hand-aligning pipe tables is driving you mad. → 🎲

Mock Data Generator

Generate fake names, emails, addresses, dates, numbers, and UUIDs as JSON, CSV, or SQL INSERTs, with a seed for reproducible runs.

Use it when you need realistic-looking test rows for a demo, fixture, or database without touching real user data. → 🔍

Regex Tester

Try regular expressions with live match highlighting, capture group tables, replace preview, and a plain-English pattern breakdown.

Use it when you are writing or debugging a regex and want to see exactly what it matches before it ships. → 🗄️

SQL Formatter

Beautify SQL with uppercase keywords, one clause per line, and indented conditions and subqueries, or minify it to a single line.

Use it when a query from logs, an ORM, or a teammate arrives as an unreadable one-liner and you need to understand it fast. → 🔄

YAML ↔ JSON Converter

Convert YAML to JSON and JSON to YAML live in side-by-side panels, with clear errors and line highlighting.

Use it when you are translating Kubernetes manifests, CI configs, or API payloads between YAML and JSON. →

Text & Writing 14

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Case Converter

One input, nine live case styles: Title Case, Sentence case, camelCase, snake_case, kebab-case, and more with per-row copy.

Use it when you need a heading, variable name, or constant in a specific case style without retyping it. → 💬

Chat Export Cleaner

Convert a copied ChatGPT or Claude conversation into clean markdown or a JSON messages array with automatic role detection.

Use it when you want to save, share, or reuse an AI conversation in a readable or machine-friendly format. → 🧱

Few-Shot Example Formatter

Turn input/output pairs into clean few-shot example blocks in XML tags, markdown headings, or a JSON array.

Use it when you are adding examples to a prompt and want them formatted the way models parse most reliably. → 🔍

Find and Replace

Search and replace with regex, case-sensitive, and whole-word options, plus a live highlighted preview and match count.

Use it when you need to see exactly what a replace will change before applying it, especially with regex. → 🏷️

Keyword Extractor

Pull the top keywords and key phrases from any text using frequency scoring with stopwords removed and phrases boosted.

Use it when you need tags, SEO keywords, or a quick topic summary before computing embeddings. → 🌐

Language Detector

Approximate language detection for 14 Latin-script languages plus Unicode script recognition for Chinese, Arabic, Cyrillic, and more.

Use it when you have a snippet of text and need a quick guess at what language it is written in. → 🧹

Line Tools

Dedupe, sort, shuffle, number, trim, and prefix text lines with chainable operations and undo.

Use it when you have a messy list of lines to clean up: duplicates to remove, order to fix, or prefixes to add. → 📦

Prompt Compressor

Rule-based prompt shortener that trims wordy phrases and duplicate sentences, showing tokens saved and every rule applied.

Use it when a prompt has grown verbose and you want to cut token cost without changing its meaning. → 📖

Readability Scorer

Flesch Reading Ease and Flesch-Kincaid grade level with long-sentence and passive-voice highlighting.

Use it when you want to know if your writing is easy enough for its target audience before you publish. → ⏱️

Reading Time

Reading time at slow, average, and fast speeds, speaking time at presentation pace, and an LLM token estimate.

Use it when you are timing an article, talk, or voiceover, or budgeting tokens before sending text to an AI model. → 🔗

Slug Generator

Turns titles into clean URL slugs: accents stripped, punctuation removed, word-boundary length limit, batch mode.

Use it when you need SEO-friendly URL slugs for blog posts or pages, one or a whole list at a time. → ✂️

Text Splitter

Split long text into numbered parts that each fit a token or character budget, breaking at paragraph and sentence boundaries.

Use it when a document is too long to paste into ChatGPT, Claude, or an X post in one go. → 🎙️

Transcript Cleaner

Strip timestamps, speaker labels, filler words, and stutter repeats from meeting or video transcripts, with before/after stats.

Use it when you need a raw Zoom, Teams, or YouTube transcript cleaned up before summarizing or publishing it. → 📊

Word Frequency

Top words plus 2-word and 3-word phrases with counts and keyword density percentages, stopword and length filters.

Use it when you want to check SEO keyword density or see which terms your draft actually emphasizes. →

Developer Utilities 14

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Base64 Encoder / Decoder

UTF-8 safe Base64 encoding and decoding with auto-detect direction, plus a file to data URI converter.

Use it when you need to encode text or files as Base64, decode a Base64 blob, or inline a small asset as a data URI. → 📝

Commit Message Builder

Build conventional commit messages with type, scope, body, and BREAKING CHANGE footers, plus live 50/72 length gauges.

Use it when adopting conventional commits or teaching a team the format that powers changelogs and semantic release. → 🗓️

Cron Expression Builder

Build cron schedules from presets and dropdowns, read them back in plain English, and preview the next 5 run times in local time or UTC.

Use it when writing or decoding a crontab or GitHub Actions schedule and you want to be sure when it will actually fire. → 🔒

Hash Generator

SHA-256, SHA-384, SHA-512, and SHA-1 digests of any text or file via WebCrypto, in hex and Base64.

Use it when you need a checksum to verify a download, pin a file version, or generate a content hash for caching. → 🚦

HTTP Status Lookup

Every common HTTP status code with a plain-English meaning and a practical fix, searchable by number or keyword.

Use it when an API returns a mystery code and you need to know whether to retry, back off, or fix your request. → 🎫

JWT Decoder

Paste a JSON Web Token to see its header and payload pretty-printed, with exp/iat/nbf as local dates and a live valid or expired badge. Decoding only, no signature check.

Use it when an API rejects your token and you need to see what is inside it and whether it has expired. → 📑

Markdown TOC Generator

Paste markdown and get a nested table of contents with GitHub-style anchor slugs, code blocks skipped, duplicates handled.

Use it when a README or docs page has grown long enough to need navigation links that actually work on GitHub. → 🔐

Password Generator

Cryptographically secure passwords and word passphrases with entropy in bits, crack-time estimates, and bulk generation.

Use it when you need a strong password or a memorable passphrase and want to know how strong it really is. → 🧵

String Escape / Unescape

Escape or unescape JSON strings, HTML entities, and backslash sequences, plus a mode that turns whole code blocks into safe JSON strings for API payloads.

Use it when quotes and newlines in your text keep breaking a JSON body, an HTML page, or an LLM prompt payload. → 🔀

String Similarity

Compare two texts with Levenshtein edit distance, similarity percent, Jaccard word overlap, and longest common substring.

Use it when deduping records, tuning fuzzy-match thresholds, or comparing LLM outputs against expected answers. → 🌍

Time Zone Planner

See a meeting time in up to 6 participant time zones with business-hours highlighting and a best-overlap finder.

Use it when scheduling calls across offices and you want the least painful slot for everyone. → ⏱️

Unix Timestamp Converter

Convert epoch timestamps (seconds or milliseconds, auto-detected) to local, UTC, and 25+ timezones with relative time, plus date-to-timestamp and a live ticker.

Use it when a log or API hands you a raw epoch number and you need to know what moment it actually is. → 🔗

URL Encoder / Decoder

Percent-encode or decode text with encodeURIComponent vs encodeURI explained, plus an editable query-string parameter table that rebuilds the URL live.

Use it when a URL breaks on special characters or you need to inspect and edit the parameters buried in a long query string. → 🆔

UUID / ULID Generator

Cryptographically random UUID v4 or timestamp-sortable ULIDs, single or up to 1000 in bulk with copy and download.

Use it when you need unique IDs for records, test data, or correlation keys, sortable ones included. →

Business & Productivity 7

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AI Disclosure Generator

Pick content type, AI role, and tone to get ready-to-paste AI disclosure statements for blogs, products, chatbots, code, and academic work.

Use it when you need to tell readers, customers, or reviewers how AI was involved in your work. → 📊

AI SaaS Unit Economics

Model gross margin per user, blended margin, and break-even users for an AI product, with AI cost x2 and /2 sensitivity.

Use it when pricing or sanity-checking an AI product whose inference costs eat into classic SaaS margins. → 📜

AI Usage Policy Generator

Answer a few questions about your org and get a professional, ready-to-edit company AI usage policy in markdown.

Use it when your company needs a starting-point AI policy covering permitted use, data rules, and accountability. → 💰

Break-Even Pricing

Turn your cost per AI operation into a price floor, a recommended price at your target margin, and a usage-based vs flat-rate comparison.

Use it when deciding what to charge for an AI feature so heavy users do not flip unprofitable. → ⏱️

Meeting Cost Calculator

See the true cost of any meeting per session and per year, with a live ticker that counts the money during a running meeting.

Use it when deciding whether a recurring meeting earns its keep or should become an email or AI summary. → 🗂️

Task Prioritizer (Eisenhower)

Sort tasks into Do, Schedule, Delegate, and Eliminate quadrants by urgency and importance, then export a markdown checklist.

Use it when your to-do list is overflowing and you need to decide what actually deserves your time today. → ⚖️

Weighted Decision Matrix

Score options against weighted criteria with live totals, winner highlighting, and a sensitivity check on your weights.

Use it when you are choosing between vendors, tools, candidates, or plans and want the tradeoffs on paper. →

Marketing & SEO 7

#️⃣

Hashtag Formatter

Turn keywords into clean, accessible #CamelCase hashtags with a lowercase variant, deduping, and copy-ready sets sized for X, LinkedIn, and Instagram.

Use it when you want readable, screen-reader-friendly hashtags in the right quantity per platform. → 🏷️

Meta Tag Generator

Generate a complete head block with SEO title, meta description, canonical, Open Graph, and Twitter Card tags, with live Google and social previews.

Use it when publishing a new page and you want its search snippet and share cards done right the first time. → 🤖

Robots.txt AI Crawler Blocker

Allow or block GPTBot, ClaudeBot, Google-Extended, PerplexityBot, and other AI crawlers bot by bot, then copy a ready-to-use robots.txt.

Use it when deciding whether AI companies may train on or cite your site's content. → 🧩

Schema Markup Generator

Build JSON-LD structured data for Article, FAQ, Course, HowTo, Organization, and Person with per-type forms, required-field hints, and a copy-ready script block.

Use it when adding rich-result structured data to a page without hand-writing JSON-LD. → 📏

Social Post Length Checker

Check one post against X, LinkedIn, Instagram, Facebook, YouTube, and TikTok limits at once, including see-more fold previews and X's 23-character URL rule.

Use it when writing one post for several platforms and you need to know where each one cuts you off. → 🔗

UTM Link Builder

Build campaign tracking URLs with source, medium, and campaign parameters, proper encoding, and a saved history of your last ten links.

Use it when you need consistent, correctly encoded UTM links for email, social, or paid campaigns. → 🧵

X Thread Splitter

Split long text into numbered 280-character tweets at sentence boundaries, with numbering styles, hashtag placement, per-part copy, and a LinkedIn mode.

Use it when turning an article or long idea into a clean, ready-to-post X thread. →

Media & Voice 7

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Color Palette Generator

Turn one base color into hex/RGB/HSL conversions, a 10-step tint and shade ramp, harmony schemes, and WCAG AA/AAA contrast checks.

Use it when you need a full color scale or an accessibility contrast check from a single brand color. → 🎙️

Dictation Pad

Speech-to-text notepad with live interim results, 10 languages, and an editable transcript you can copy or download.

Use it when talking is faster than typing: drafting prompts, notes, or first drafts by voice. → 😀

Emoji Favicon Generator

Turn any emoji into 16/32/48/180px favicon PNGs with optional background and rounded corners, a live tab preview, and ready-to-paste HTML tags.

Use it when a side project needs a favicon in thirty seconds. → 🕵️

EXIF Stripper

Remove GPS location, device details, timestamps, and all other hidden metadata from photos by re-encoding them on a canvas in your browser.

Use it before posting or sharing any photo you took on your phone. → 🗜️

Image Compressor

Shrink JPEG and WebP images with a quality slider, optional resize, and before/after size comparison, all in your browser.

Use it when a screenshot or photo is too big to email, upload, or send to a vision API. → 📐

Image Resizer for AI Vision

Resize or center-crop images to vision-model presets like 1568px for Claude, 1024, 512, or any custom size, then download as PNG or JPEG.

Use it when you are preparing screenshots or photos for a vision API and do not want to waste tokens on oversized pixels. → 🔊

Text to Speech Reader

Have your browser read any text aloud with selectable voices, speed and pitch controls, and live sentence highlighting.

Use it to proof-listen a draft, check how AI-generated copy flows, or rest your eyes. →

Learning & Planning 8

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