Free online tools that run in your browser
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JSON Formatter
Format, beautify, minify and validate JSON instantly in your browser. Free, private, no upload required.
JSON Validator
Validate JSON instantly in your browser with precise line and column error reporting. Supports JSON Lines batch checking. Free, private, no upload.
Base64 Converter
Convert text to Base64 and back in your browser. Full UTF-8 support for Chinese, Japanese and emoji, with clear errors for bad padding.
URL Encoder / Decoder
Percent-encode and decode URL components in your browser with encodeURIComponent. Detects malformed % sequences and handles Unicode safely.
JWT Decoder
Decode any JSON Web Token in your browser. Pretty-prints header and payload, shows the signature, and checks whether the token is expired.
UUID Generator
Generate cryptographically random UUID v4 strings in your browser. Batch up to 1000, choose uppercase or compact form, copy or download as a file.
Timestamp Converter
Convert Unix timestamps to local and UTC dates and back. Auto-detects seconds vs milliseconds, shows the current time, and copies values in one click.
Regex Tester
Test regular expressions live in your browser. Highlight every match, list capture groups, and get a clear error when the pattern is invalid.
SQL Formatter
Format and beautify SQL in your browser. Choose PostgreSQL, MySQL, SQLite, BigQuery, T-SQL and more, pick indentation, then copy or download.
Markdown Editor
Write Markdown on the left and see a live sanitized preview on the right. Copy or download the rendered HTML. Runs entirely in your browser.
Color Picker
Pick colors with a native color wheel and instantly convert between HEX, RGB and HSL. Copy any value with one click. Free, private, runs in your browser.
HEX to RGB Converter
Convert HEX color codes to RGB and back instantly. Supports 3 and 6 digit HEX values, validates input and copies results. Free, private, browser-based.
CSS Gradient Generator
Build beautiful linear and radial CSS gradients. Add color stops, tune the angle, preview live and copy the ready-to-use CSS. Free, private, browser-based.
Box Shadow Generator
Design CSS box shadows visually. Tune offset, blur, spread and color, toggle inset shadows, preview live and copy the CSS. Free and private.
Border Radius Generator
Round corners visually with independent controls for all four corners. Use pixels or percent, preview live and copy the border-radius CSS. Free.
SVG Viewer
Paste SVG markup to preview it instantly in the browser. Scripts and unsafe markup are stripped, then you can copy or download the cleaned .svg file. Free and private.
PNG to WebP
Convert PNG images to WebP directly in your browser. Adjust quality, preview the result, and download smaller WebP files. Free, private, no upload.
JPG to PNG
Convert JPG and JPEG images to PNG in your browser. Lossless output with preview and one-click download. Free, private, no upload required.
WebP to PNG
Convert WebP images to PNG in your browser when you need broad compatibility. Preview, check dimensions, and download. Free and private.
SVG to PNG
Convert SVG markup to PNG in your browser. Untrusted SVG is sanitized before rendering, then rasterized to a high-resolution PNG you can download.
JSON to YAML
Convert JSON to YAML and YAML back to JSON in your browser. Validates input, shows precise errors, and supports copy and download. Free and private.
CSV to JSON
Convert CSV spreadsheets to JSON arrays in your browser. Supports quoted fields, escaped quotes, custom delimiters, and inconsistent row lengths. Free and private.
Image Compressor
Compress images directly in your browser with an adjustable quality slider. Compare before and after sizes and download the optimized file. Free and private.
Image Resizer
Change image dimensions in your browser. Lock the aspect ratio, resize by pixels or percent, preview the result, and download. Free and private.
Image Cropper
Crop images in your browser by dragging a selection rectangle. Live preview of the selected area and one-click PNG export. Free and private.
Image Watermark
Add a text watermark to your photos in the browser. Adjust text, size, color, opacity, position, or tile mode, then download. Free and private.
QR Code Generator
Create QR codes from any text or URL in your browser. Adjust size and error correction level, preview instantly and download a PNG. Free, private, no sign-up.
Text Diff Checker
Compare two texts side by side and see added, removed and changed lines highlighted instantly. Copy the diff report. Free, private, runs in your browser.
Audio Cutter
Cut and trim audio files directly in your browser. Waveform preview, precise start and end times, export as WAV. Free, private, no upload required.
Audio Converter
Convert audio files in your browser with the Web Audio API. Export to WAV (PCM) and, where supported, WebM/Opus, OGG/Opus or M4A. Free, private, no upload.