The toolbox that lives in your tab
Client-side utilities for everyday engineering — format data, convert images, test regex, mint UUIDs, decode tokens, and tidy design assets. Fast, private, and always free.
28tools live
100%client-side
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Why A Tool For
Everything you need, nothing you don't
We cut the bloat. No dashboards, no accounts, no “upgrade to pro” — just focused tools that stay in the browser and get out of your way.
Private by default
Everything runs in your browser. Your files and text never leave your device — no uploads, no accounts watching.
Instant results
No server round-trips. Convert, format, generate, and test right where you are — usually in milliseconds.
No account needed
Open any tool and start working. Zero sign-up, zero paywalls, zero friction.
One place for daily work
From data and auth to images, design, IDs, and web3 — the small utilities you open a dozen times a day.
The collection
Pick a tool, start building
Encoding, images, auth, design, web3, and more — every tool runs locally. Click any card to jump straight in.
- ABI EncoderEncode ABI parameters into hex calldata. Keep the parameter list in ABI format and use a JSON array for the values.
- ABI DecoderDecode ABI-encoded hex calldata back into structured values. Use the same parameter list and order that was used for encoding.
- Color PaletteCreate production-ready color systems or explore curated combinations for your next project.
- Case ConverterConvert text to camelCase, PascalCase, snake_case, kebab-case, Title Case, and URL slugs. Batch convert one identifier per line.
- cURL ConverterConvert curl commands to fetch, axios, Python requests, Go, PHP, and more. Live codegen and a masked request preview.
- Diff CheckerCompare two blocks of text or code side-by-side. Live line and word highlighting in the editors, ignore options, and a copyable patch.
- Dummy JSON GeneratorDefine fields and types, set how many objects to generate, and get pretty-printed mock JSON for testing and development.
- Dummy Text GeneratorGenerate readable placeholder copy by paragraphs, sentences, words, or characters. Choose a writing style for text that feels natural instead of random gibberish.
- ETH Address ChecksumNormalize any Ethereum address to its checksummed form and quickly verify whether the current input already matches the checksummed result.
- ETH ConverterEther (ETH) is commonly represented in different denominations, such as Wei for smart contract interactions and Gwei for gas fee calculations. Use our Unit Converter to quickly and easily convert between ETH, Gwei, Wei, and other Ethereum units.
- Favicon GeneratorCreate favicons from an image, text monogram, or emoji. Download ICO, PNGs, apple-touch, PWA icons, webmanifest, and HTML.
- Font Pair GeneratorGenerate contrast-balanced Google Font combinations with lockable slots, live preview, and copy-ready CSS.
- Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes for text or files. Compare checksums and switch hex or Base64 output.
- Image ConverterConvert images between PNG, JPEG, WebP, and AVIF. Batch convert photos including HEIC.
- JSON FormatterFormat, validate, beautify, and minify JSON instantly. Check for syntax errors and improve readability.
- JSON to CSVConvert JSON arrays to CSV and CSV to JSON. Flatten nested objects, choose delimiters, and copy or download.
- JSON to YAMLConvert JSON to YAML and YAML to JSON. Live validation, indent and sort options.
- JWT DecoderDecode and verify JSON Web Tokens. Inspect header and payload claims and check signatures.
- JWT EncoderBuild and sign JSON Web Tokens. Edit header and payload JSON, choose an algorithm, and generate a signed token.
- Magic EraserFree online watermark remover. Erase watermarks, logos, stamps, text overlays, and small objects from photos in your browser. Brush the area, remove it, then compare before and after — your image never leaves this device.
- Markdown EditorWrite GitHub-Flavored Markdown with a live preview. Format with a toolbar, then copy or download Markdown and HTML.
- QR Code GeneratorGenerate scannable QR codes for text, URLs, email, phone, SMS, WiFi, and JSON.
- Regex TesterTest JavaScript regular expressions with live match highlighting, capture groups, recipe presets, click-to-insert tokens, and plain-English explanations.
- SQL FormatterBeautify SQL online with dialect-aware rules. Choose dialect and keyword case for PostgreSQL, MySQL, SQLite, T-SQL, and more.
- Text Base ConverterConvert text to binary, hexadecimal, octal, or decimal and decode back instantly. UTF-8 and ASCII support with customizable delimiters.
- Text to HTMLFormat text visually in a rich editor and export clean HTML instantly. Copy, download, or preview the output for websites, emails, and CMS platforms.
- Timestamp ConverterConvert Unix timestamps and ISO 8601 strings into readable dates, or build timestamps from a date and time. Supports seconds through nanoseconds.
- UUID GeneratorGenerate UUID v4, v7, v1, or Nil identifiers. Bulk generate, format options, download TXT/CSV/JSON, and inspect version and timestamps.
Your turn
Want a tool we don't have?
Tell us what you're looking for. We read every suggestion and build the ones that help the most people.
- Any idea welcome — rough sketches count
- Name and email optional
- We'll work on the best ones