QiLing ToolsFree Online PDF, Image, Audio, Video, Mind Map & JSON Tools
787 everyday tools, all running locally in your browser. No uploads, no sign-up, no limits.
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🆕New tools
Changelog →🔍Convex Lens LabVirtual optical bench: move the candle, lens and screen to find a sharp image, measure focal length, learn the lens rules and correct short and long sight.🪞Reflection & Plane MirrorsInteractive school optics: test the law of reflection, specular vs diffuse reflection, plane mirror images, two mirrors, periscope and pinhole camera.🔴Seal ExtractorFree online seal extractor: lift a red or blue stamp off a scan into a transparent PNG, dropping paper, tint and specks. Solid colour, auto-trim, runs locally.🗓️ICS Calendar FileFree online ICS generator: build .ics files with times, location, recurrence and alarms for Apple Calendar, Outlook or Google, or read an .ics someone sent you.📱China Phone Number CheckFree checker for Chinese mobile numbers: validate the format, identify the carrier by prefix, flag MVNO, IoT and satellite ranges, and export them as CSV.🔤ASCII TableFree online ASCII table: codes 0-127 in decimal, hex, octal, binary and escape form, every control character explained, Latin-1 128-255 and a code point lookup.
Why QiLing Tools
🔒 Files never leave your device
Powered by WebAssembly, all PDF, image, audio and video processing runs inside your browser. Contracts, ID documents and recordings are never uploaded to any server.
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Open and use. No subscriptions, no queues, no watermarks, no daily quotas.
🧰 One place for everyday tasks
Covers merging, splitting and compressing PDFs, compressing, converting and watermarking images, trimming and converting audio, compressing video, making GIFs, drawing mind maps and formatting JSON online.