Clear before clever
Each tool is designed around one job, with readable labels, sensible defaults, and an explanation of what happens to your input.
Smart utilities for modern work
Everyday tools.
Built better.
Practical utilities for writing, files, images, data, and daily calculations. No account required. Most work stays in your browser; tools that contact an external service say so before you use them.
154 focused utilities
Local-first processing
No account required
Start here
Tools worth bookmarking
A short list of dependable utilities we use ourselves.
01
JSON Formatter
Validate an API response, find a syntax error, and turn compact JSON into something readable.
Open formatter → 02Image Compressor
Compare file sizes as you tune quality. Your source image stays on your device.
Compress an image → 03Text Compare
See additions and removals clearly before you publish, send, or merge a revision.
Compare text →The library
Find the right tool
Browse by category or search by the job you need to finish.
154 tools
Finance & Money3
Audio & Media6
🎵
Audio Converter
Convert audio to WAV or MP3, in your browser.
🎙️
Voice Recorder
Record your microphone and download the audio.
🎧
Video to Audio (MP3)
Extract the audio track from a video.
🎬
Video to GIF
Turn a short video clip into an animated GIF.
✂️
Video Trimmer
Cut a clip out of a video, in your browser.
🗜️
Video Compressor
Shrink a video's size by lowering resolution.
Image Tools16
📝
Image to Text (OCR)
Extract text from images right in your browser.
🗜️
Image Compressor
Shrink JPG/PNG/WebP file size, no upload.
📐
Image Resizer
Resize images to exact pixels, download instantly.
🔃
Image Format Converter
Convert between PNG, JPG and WebP.
🧼
EXIF Remover
Strip metadata and GPS from photos in your browser.
🔬
EXIF Viewer
View a photo's hidden metadata (camera, GPS…).
🔲
Image Cropper
Crop an image to any area, download instantly.
🧩
Base64 to Image
Decode a Base64 data URI back into an image.
⭐
Favicon Generator
Make favicon sizes (16–512px) from an image.
🎯
Image Color Picker
Pick a color (HEX/RGB) from any point of an image.
🖼️
PNG to JPG
Convert PNG images to JPG in your browser.
🖼️
JPG to WebP
Convert JPG to modern WebP for smaller files.
🖼️
WebP to JPG
Convert WebP images back to JPG.
🖼️
JPG to PNG
Convert JPG images to PNG in your browser.
🖼️
Image to WebP
Convert any image to WebP for smaller files.
📐
Image DPI Calculator
Pixels + DPI → print size (and vice versa).
Network & IT13
🌍
What Is My IP
See your public IP address, location & ISP.
📍
IP Address Lookup
Look up location and ISP for any IP address.
🧭
DNS Lookup
Query A, AAAA, MX, TXT, NS & CNAME records.
🔎
Domain / WHOIS Lookup
Registrar, dates and nameservers for a domain.
🖧
Subnet Calculator
CIDR to network, broadcast, range & host count.
🕵️
User Agent Parser
Decode a browser user-agent string.
🧮
CIDR Calculator
CIDR notation to IP range, mask & host count.
🔢
IPv4 to Binary/Hex
Convert an IPv4 address to binary, decimal & hex.
🔁
Reverse DNS Lookup
Find the hostname (PTR) for an IP address.
📬
MX Lookup
Check a domain's mail (MX) servers.
📶
IP Range Calculator
Two IPs → address count and CIDR blocks.
🌐
IPv6 Calculator
Expand, compress & get the range of IPv6.
⚡
Internet Speed Test
Measure speed, latency, jitter and real-world readiness.
PDF & Files5
📄
JPG to PDF
Combine images into a single PDF, no upload needed.
📎
Merge PDF
Merge multiple PDFs into one file in your browser.
🖼️
PDF to JPG
Convert each PDF page to an image, no upload needed.
📃
PDF to Text
Extract the text from a PDF in your browser.
✂️
Split PDF
Extract a page range from a PDF, no upload needed.
Developer & Data37
🔁
Base64 Encode/Decode
Encode or decode Base64 text safely (UTF-8).
🔗
URL Encoder/Decoder
Percent-encode or decode URLs and parameters.
{ }
JSON Formatter
Beautify, minify & validate JSON.
#️⃣
Hash Generator
SHA-1, SHA-256 & SHA-512 hashes of any text.
🕒
Unix Timestamp Converter
Convert between Unix time and human dates.
⬇️
Markdown Preview
Live Markdown editor with instant HTML preview.
🔍
Regex Tester
Test regular expressions with live match highlighting.
🎟️
JWT Decoder
Decode a JWT's header and payload in your browser.
⟨⟩
HTML Entity Encode/Decode
Escape or unescape HTML special characters.
🌐
URL Parser
Break a URL into its parts and query params.
📱
Device & Browser Info
See your screen size, OS, browser & more.
🖇️
Image to Base64
Encode an image as a Base64 data URI.
🏷️
Meta Tag Generator
Generate SEO & Open Graph meta tags.
🔃
JSON ⇄ YAML
Convert JSON to YAML and YAML back to JSON.
🧽
URL Cleaner
Strip tracking parameters (utm_, fbclid…) from URLs.
🧾
HTML Formatter
Beautify or minify HTML code.
🎛️
CSS Formatter
Beautify or minify CSS code.
🗄️
SQL Formatter
Format and pretty-print SQL queries.
🔠
Text ⇄ Hex
Convert text to hexadecimal and back.
✔️
UUID Validator
Check if a string is a valid UUID & its version.
⏲️
Cron Expression Helper
Build & understand cron schedules.
🔣
Unicode Converter
Text ⇄ Unicode code points and \u escapes.
✅
JSON Validator
Check if JSON is valid and see the error.
🗜️
JSON Minifier
Compress JSON to the smallest valid form.
🎫
JWT Generator
Create a signed HS256 JWT in your browser.
🗄️
SQL Minifier
Compress SQL to a single line.
🔒
SHA-256 Generator
Hash text with SHA-256 (and SHA-1/384/512).
⌨️
Hacker Typer
Typing practice with movie-style hacker text.
📡
API Request Builder
Build and test HTTP requests with live preview.
🕵️
JWT Debugger
Decode and inspect JWT tokens with syntax highlighting.
🧼
HTML Sanitizer
Clean and sanitize HTML to prevent XSS attacks.
🧱
CSS Grid Visualizer
Build and preview CSS Grid layouts visually.
🗂️
Flexbox Visualizer
Interactive Flexbox layout builder and guide.
🔗
URL Slug Generator
Create SEO-friendly URL slugs from titles.
🔍
Regex Validator
Test and validate regular expressions with live feedback.
📝
YAML Validator
Validate and format YAML configuration files.
📁
XML Formatter
Beautify, minify and validate XML documents.
Security & Privacy7
🛡️
Password Auditor
Check password strength and estimate crack time.
⚠️
Breach Leak Checker
Check if your email or passwords appear in data breaches.
🔒
Security Header Generator
Generate HTTP security headers for your website.
_https
HTTPS Tester
Test your website's HTTPS configuration and SSL/TLS.
📜
CSP Tester
Test and validate Content Security Policy headers.
🚪
CORS Tester
Test Cross-Origin Resource Sharing configuration.
🔢
PIN Validator
Check PIN strength and validate formats.
Text & Writing12
🔢
Word Counter
Count words, characters, sentences & reading time.
🔠
Case Converter
UPPER, lower, Title, camelCase, snake_case & more.
📄
Lorem Ipsum Generator
Generate placeholder paragraphs, sentences or words.
🧹
Text Cleaner
Remove duplicate/empty lines, trim & sort text.
🔡
Slug Generator
Turn any title into a clean URL slug.
🔊
Text to Speech
Read text aloud and adjust the voice & speed.
😀
Emoji Picker
Search hundreds of emoji and copy instantly.
📊
Word Frequency Counter
Find the most-used words in your text.
🔀
Text Compare (Diff)
Compare two texts and highlight differences.
🔎
Find & Replace
Search and replace text, with regex support.
🔃
Reverse Text
Reverse letters, words, lines or flip upside down.
♻️
Repeat Text
Repeat any text a set number of times.
Converters10
📏
Unit Converter
Length, weight, temperature & volume units.
🔄
CSV ⇄ JSON
Convert CSV to JSON and back instantly.
Ⅻ
Roman Numeral Converter
Convert numbers to Roman numerals and back.
🖥️
Text ⇄ Binary
Translate text to binary and decode it back.
📡
Morse Code Translator
Convert text to Morse code and back, with sound.
🔢
Number Base Converter
Binary, octal, decimal & hex conversions.
🔤
Number to Words
Write numbers out in English words.
🔐
Caesar Cipher / ROT13
Encode and decode text with a letter shift.
🔡
Text ⇄ ASCII Codes
Convert text to character codes and back.
📻
NATO Phonetic Alphabet
Spell words with Alpha, Bravo, Charlie…
Generators7
🔐
Password Generator
Strong random passwords with custom rules.
🔳
QR Code Generator
Make a QR code from any text or link and download it as a PNG.
🆔
UUID Generator
Generate v4 UUIDs in bulk, copy instantly.
🎲
Random Number Generator
Pick random numbers in any range.
🎯
Random Picker
Pick a random winner from a list.
🎲
Dice & Coin
Roll dice and flip a coin.
🛡️
Password Strength Checker
Test how strong a password is (offline).
Calculators13
％
Percentage Calculator
Percent of, increase/decrease & change.
⚖️
BMI Calculator
Body mass index in metric or imperial.
🎂
Age Calculator
Your exact age in years, months & days.
🏦
Loan Calculator
Monthly payment, total interest & cost.
🧾
Tip Calculator
Split the bill and tip per person.
🏷️
Discount Calculator
Sale price and how much you save.
🧮
Sales Tax / VAT Calculator
Add or remove tax from a price.
📅
Date Difference
Days, weeks and months between two dates.
🖼️
Aspect Ratio Calculator
Resize keeping the same width:height ratio.
🔥
BMR / Calorie Calculator
Daily calorie needs from your body stats.
📈
Compound Interest Calculator
See how savings grow over time.
⏰
Hours Calculator
Add up hours & minutes; time between times.
⛽
Fuel Cost Calculator
Estimate the fuel cost of a trip.
Color & Design5
Time & Productivity9
⏱️
Timer & Stopwatch
Countdown timer and stopwatch with alarm.
☑️
Markdown Checklist
Build task checklists and copy clean Markdown.
🍅
Pomodoro Timer
Focus timer with work/break cycles using the Pomodoro technique.
📝
Meeting Notes
Structured meeting notes template with action items.
🎯
Sprint Planner
Simple agile task board with To-do and Done columns.
🖼️
Wireframe Generator
Create low-fidelity wireframes for web and mobile apps.
✅
Markdown Checklist
Build a Markdown checkbox list for wikis and GitHub.
📚
Reading Speed Test
Measure your reading speed in words per minute.
💻
Developer Quotes
Inspiring quotes for programmers with copy-as-image.
Content Tools7
🖼️
SVG Optimizer
Minify and optimize SVG files for the web.
📱
Social Card Generator
Create shareable social media cards with custom text and images.
⌨️
Typewriter Effect
Generate typewriter animation code for your website.
🎬
GIF Creator
Turn images or video into animated GIFs with custom settings.
😀
Emoji Unpacker
Extract and analyze emojis from any text with Unicode info.
📊
Text Analyzer
Readability scores, word count and content analysis.
🔤
Word Unscrambler
Find valid words from scrambled letters for word games.
Math / Science4
How we build
Small software should still feel considered.
Private where possible
Text and file tools generally run on your device. Network lookups need an external request and identify that dependency on the page.
Tested in real browsers
We check the core workflow, keyboard use, mobile layout, empty states, and downloads before a tool joins the library.
Built and maintained independently. thisuseful began as a personal set of utilities for repetitive work. The public library grows when a tool solves a specific problem well—not simply to increase the page count.
Read how the site is maintained →