Tools
Image Tools
Image Format Converter convert between formats
Convert images between PNG, JPEG, and WebP with adjustable quality and transparency handling.
Image Resizer resize by dimensions or percentage
Resize images by dimensions, percentage, or fit-within bounds with aspect ratio lock and format options.
Image Cropper interactive crop with presets
Interactively crop images with draggable selection, aspect ratio presets, and full-resolution output.
Binary Mask Creator masks for ai inpainting/edits
Paint binary black-and-white masks for AI inpainting with brush, eraser, undo, and invert options.
Image Adjust & Transform flip, rotate, adjust colors
Flip, rotate, invert colors, convert to grayscale, and adjust brightness and contrast.
SVG Viewer & Converter preview and export SVGs as raster images
Preview SVG files with zoom and background controls, inspect metadata and source, and export to PNG, JPEG, or WebP at any scale.
Viewer Tools
HTML Viewer paste HTML, see it rendered live
Paste or drop HTML code to preview it rendered in a sandboxed iframe. Side-by-side editor and preview with toggleable background.
Markdown Viewer live preview with math & code highlighting
Paste or drop Markdown for live GFM-rendered preview with syntax-highlighted code blocks and LaTeX math support. Export rendered HTML. Requires internet for CDN libraries.
JSON Formatter & Viewer format, validate, and explore JSON
Paste or drop JSON to format with syntax highlighting, collapsible tree view, validation with line-level error reporting, search, and one-click copy.
Diff Viewer compare text side-by-side with word-level highlighting
Compare two text blocks with line-level and word-level diff highlighting. Side-by-side and unified diff modes. Requires internet for diff library.
LaTeX Math Preview scratchpad for previewing LaTeX equations
Type LaTeX and see it rendered instantly with KaTeX. Per-equation error feedback, symbol palette, render mode toggle, and saved snippets. Requires internet for KaTeX.
Data Tools
YAML ↔︎ JSON Converter bidirectional conversion with validation
Convert between YAML and JSON with live validation, configurable indentation, file drop support, and sample data. Requires internet for js-yaml library.
Base64 Encoder/Decoder encode/decode images and text
Decode base64 to image with live preview and download, encode images to base64 data URIs (drag-and-drop), or encode/decode plain text.
URL Encoder/Decoder percent-encode and decode URL components
Percent-encode and decode URL strings with live conversion. Toggle between encodeURIComponent and encodeURI modes.
Most of these tools were vibe-coded so if you run into any quirks, that’s probably why.
Inspired by tools.simonwillison.net.