WebAIM Contrast Checker
A focused accessibility checker for measuring foreground and background color contrast against WCAG thresholds.
Discover
Have I Been Pwned
A public breach lookup service for checking whether an email address appears in known compromised datasets.
Cloudflare Speed Test
A browser network-quality test reporting download, upload, latency, jitter, and packet-loss measurements.
LanguageTool
A multilingual writing assistant for checking spelling, grammar, punctuation, and style in pasted text.
TableConvert
A browser table editor and converter for moving structured data between spreadsheet, markup, and code formats.
Mapshaper
A browser workbench for inspecting, simplifying, editing, and converting common geospatial data formats.
RAWGraphs
An open-source browser app for turning spreadsheet and CSV data into conventional and uncommon visualizations.
ZoteroBib
A no-account bibliography generator that turns URLs and publication identifiers into formatted citations.
diagrams.net
A full-featured browser diagram editor for flowcharts, architecture maps, network diagrams, and structured visuals.
Ezgif
A practical browser toolkit for creating, editing, optimizing, and converting animated images, video, and audio.
AudioMass
A lightweight in-browser waveform editor for recording, trimming, processing, and mixing audio without a backend.
PDF24 Tools
A broad collection of browser tools for everyday PDF editing, conversion, organization, OCR, and compression tasks.
CNVS
A free, no-sign-up collaborative whiteboard for opening a canvas, sharing its URL, and drawing together in real time.
CyberChef
A browser workbench for encoding, decoding, compression, hashing, parsing, and other data transformations.
Excalidraw
A browser-based whiteboard for hand-drawn diagrams, quick wireframes, and real-time collaboration.