The Tool Library
Every tool is free, works in your browser, and comes with a full guide. Pick a category to filter.
Prefer a dedicated page? Browse by category: AI Writing · PDF · Image · Text · Calculators · Converters · Utilities · All categories →
Word Counter
Count words, characters, sentences & reading time instantly.
Open tool → FreeWord Frequency Counter
See which words you repeat most, with counts & %.
Open tool → FreeRegex Tester
Test regular expressions with live match highlighting.
Open tool → FreeAI Token Counter
Estimate GPT & Claude tokens for your prompts.
Open tool → FreeDiff Checker
Compare two texts & highlight what changed.
Open tool → FreeText to Handwriting
Turn typed text into handwritten notes to download.
Open tool → FreeAI Content Detector
Check text for AI-writing signals (an honest guide).
Open tool → FreeReadability Checker
Flesch reading ease & grade level for your writing.
Open tool → FreeWords to Pages
How many pages is your word count? Any font & spacing.
Open tool → FreeCitation Generator
APA, MLA & Chicago citations, ready to copy.
Open tool → AIBusiness Name Generator
Generate brandable business & startup names in seconds.
Open tool → AIHashtag Generator
Get relevant hashtags for Instagram, TikTok & more.
Open tool → FreePassword Generator
Create strong, secure passwords with custom rules.
Open tool → FreeFancy Text Generator
Bold, italic, cursive & bubble styles for bios.
Open tool → FreeStrikethrough Text
Cross out text for Instagram, Discord & more.
Open tool → FreeSmall Caps Generator
ꜱᴍᴀʟʟ ᴄᴀᴘꜱ, superscript & subscript.
Open tool → FreeUpside Down Text
Flip or mirror text, then paste anywhere.
Open tool → FreeInstagram Line Break
Make bio & caption spacing actually stick.
Open tool → FreeCase Converter
Convert text to UPPER, lower, Title & sentence case.
Open tool → FreeQR Code Generator
Turn any link or text into a downloadable QR code.
Open tool → FreePercentage Calculator
Work out percentages, increases & differences.
Open tool → FreeUnit Converter
Length, weight, temperature, volume & speed.
Open tool → FreeAge Calculator
Your exact age in years, months & days.
Open tool → FreeDays Between Dates
Days, weeks, months & years between two dates.
Open tool → FreeGPA Calculator
Weighted GPA from grades & credit hours.
Open tool → FreeFinal Grade Calculator
Find the score you need on your final exam.
Open tool → FreeScientific Calculator
Trig, logs, powers & roots — full expression calc.
Open tool → FreeBMR & TDEE Calculator
Daily calorie needs from your stats & activity.
Open tool → FreeMortgage Calculator
Monthly payment, total interest & payoff.
Open tool → FreeCompound Interest Calculator
See savings grow with regular contributions.
Open tool → FreeSales Tax & VAT Calculator
Add tax to a price or strip it back out.
Open tool → FreeBody Fat Calculator
US Navy method — body fat, fat & lean mass.
Open tool → FreeSalary Calculator
Hourly ⇄ weekly ⇄ monthly ⇄ annual pay.
Open tool → FreeHours Calculator
Weekly time card with breaks & total pay.
Open tool → FreeWater Intake Calculator
How much water you should drink a day.
Open tool → FreeIdeal Weight Calculator
Healthy weight range for your height.
Open tool → FreeDue Date Calculator
Pregnancy due date, week & trimester milestones.
Open tool → FreeROI Calculator
Return on investment & annualised return.
Open tool → FreeFuel Cost Calculator
Trip fuel cost, split per passenger.
Open tool → FreeBMI Calculator
Body Mass Index — metric & imperial.
Open tool → FreeLoan Calculator
Monthly payment, interest & total cost.
Open tool → FreeColor Converter
HEX, RGB & HSL with a color picker.
Open tool → FreeJSON Formatter
Beautify, minify & validate JSON.
Open tool → FreeCharacter Counter
Count characters with live platform limits.
Open tool → FreeLorem Ipsum Generator
Placeholder text by paragraph, sentence or word.
Open tool → FreeBase64 Encoder
Encode & decode Base64 text instantly.
Open tool → FreeMarkdown to HTML
Clean HTML code + live preview, instantly.
Open tool → FreeRoman Numeral Converter
Numbers ⇄ Roman numerals, both directions.
Open tool → FreeBinary & Hex Converter
Decimal, binary, hex & octal — all at once.
Open tool → FreeCSV to JSON Converter
Convert CSV ⇄ JSON both ways, instantly.
Open tool → FreeNumber to Words
Spell any number — plus cheque/currency format.
Open tool → FreeHash Generator
MD5, SHA-1 & SHA-256 hashes from any text.
Open tool → FreeMorse Code Translator
Text ⇄ Morse with audio playback.
Open tool → FreeJWT Decoder
Decode JSON Web Token header & payload.
Open tool → FreeURL Encoder & Decoder
Percent-encode & decode, with query parser.
Open tool → FreeHTML Encoder & Decoder
Escape HTML entities & decode them back.
Open tool → FreeSQL Formatter
Beautify messy queries or minify to one line.
Open tool → FreeUnix Timestamp Converter
Epoch ⇄ date, seconds or milliseconds.
Open tool → FreeText to Binary
Text ⇄ binary, hex & decimal character codes.
Open tool → FreeTime Zone Converter
Compare times across cities, DST handled.
Open tool → FreeDiscount Calculator
Sale price and savings in seconds.
Open tool → FreeTip Calculator
Tip, total and per-person split.
Open tool → AISlogan Generator
Catchy taglines for any brand.
Open tool → AIUsername Generator
Unique handle ideas for any platform.
Open tool → FreeUUID Generator
Random UUID v4 values in bulk.
Open tool → FreeRandom Number Generator
Random numbers in any range, unique option.
Open tool → FreeInvoice Generator
Create & print professional invoices, no sign-up.
Open tool → FreeCountdown Timer
Live countdown to any date & time.
Open tool → FreeSignature Pad
Draw & download your signature as transparent PNG.
Open tool → FreeTimer, Stopwatch & Pomodoro
Countdown, stopwatch & 25/5 focus sessions with alarm.
Open tool → FreeWheel Spinner
Random name picker wheel — spin for a winner.
Open tool → FreeOnline Notepad
Distraction-free notes that auto-save in your browser.
Open tool → FreePassword Strength Checker
Test your password & see its crack time, privately.
Open tool → FreeCron Expression Parser
Explain a cron schedule & preview next runs.
Open tool → FreeBarcode Generator
Scannable Code 128 barcodes, PNG or SVG.
Open tool → FreeDice Roller & Coin Flip
Roll D4–D20 with modifiers, or flip a coin.
Open tool → FreeImage Resizer
Resize to exact pixels — private, no upload.
Open tool → FreeImage Compressor
Shrink file size with a live quality slider.
Open tool → FreeImage Converter
PNG ↔ JPG ↔ WebP in one click.
Open tool → FreeRotate & Flip Image
Fix orientation or mirror an image fast.
Open tool → FreeImage Cropper
Crop to any area or preset ratio.
Open tool → FreeAdd Text to Image
Captions, titles & watermarks with live preview.
Open tool → FreeRound Image Maker
Circle-crop profile pics with transparent PNG.
Open tool → FreeImage to Text (OCR)
Extract text from photos & screenshots, in your browser.
Open tool → FreeBackground Remover
Erase an image background — private, in your browser.
Open tool → FreeMeme Generator
Classic top/bottom text memes, no watermark.
Open tool → FreeColor Palette Generator
Generate color schemes & copy hex codes.
Open tool → FreeColor Contrast Checker
WCAG AA & AAA pass/fail with live preview.
Open tool → FreeCSS Gradient Generator
Linear & radial gradients, copy-ready CSS.
Open tool → FreeBox Shadow Generator
Layered CSS shadows with live preview.
Open tool → FreeAspect Ratio Calculator
Resize without distortion — 16:9, 1:1 & more.
Open tool → FreeFavicon Generator
Favicons from an image, emoji or letters + HTML.
Open tool → FreeImage Color Picker
Click any pixel for HEX, RGB & a colour palette.
Open tool → FreeReverse Text
Flip letters, words or lines backwards.
Open tool → FreeRemove Line Breaks
Clean up broken PDF & email text.
Open tool → FreeText to Slug
SEO-friendly URL slugs from any title.
Open tool → FreeFind & Replace
Bulk-swap words with live match count.
Open tool → FreeText to Speech
Read any text aloud with natural voices.
Open tool → AIAI Email Writer
Write professional emails from a one-line prompt.
Open tool → AIAI Paragraph Writer
Generate clear paragraphs on any topic.
Open tool → AIAI Text Summarizer
Condense any article into key points.
Open tool → AIAI Rewriter
Improve clarity, grammar & tone instantly.
Open tool → FreeMerge PDF
Combine multiple PDFs into one file.
Open tool → FreeSplit PDF
Extract a page range into a new PDF.
Open tool → FreeImages to PDF
Turn JPG & PNG images into a PDF.
Open tool → FreePDF to JPG
Convert PDF pages into images.
Open tool → FreeInstagram Line Break
Keep blank lines in IG bios & captions.
Open tool → FreeJSON to YAML
Turn JSON into clean indented YAML.
Open tool → FreeYAML to JSON
Config YAML into formatted JSON.
Open tool → FreeImage to Base64
Data URI with ready-made snippets.
Open tool → FreeXML Formatter
Pretty-print, minify and validate XML.
Open tool → FreeCSS Minifier
Compress CSS and see the bytes saved.
Open tool → FreeJavaScript Minifier
Safe minify — no variable renaming.
Open tool → FreeHTML Minifier
Compress markup, protect pre & script.
Open tool → FreeMeta Tag Generator
SEO, Open Graph & Twitter tags.
Open tool → FreeOpen Graph Preview
See how your link looks when shared.
Open tool → Freerobots.txt Generator
Crawl rules plus AI crawler blocking.
Open tool →Not just tools — the playbook
Most sites dump a tool on you and walk away. We pair every tool with guidance so you get a result you can actually use.
Real working tools
Built and owned by us — not a directory of links to someone else's apps.
Guides & examples
Every tool includes how-to steps, real examples and an FAQ.
Instant & private
Runs in your browser. No sign-up, no waiting, nothing stored.
Earn with AI
Tutorials on turning these tools into real income online.
Make Money with AI
Practical, honest guides on using AI tools to earn — freelancing, content, side hustles and small business.
About AI Toolbox
AI Toolbox is on a mission to make AI genuinely useful for everyone — not just people who already know the prompts. We build free, focused AI tools and teach you exactly how to get the most out of each one. New tools and guides ship every week.