Free Online Tools: Private, No Upload, No Sign-up

Audio

MetronomeAn accurate online metronome with time signatures, accents and tap tempo.
Noise Generator: White, Pink & BrownWhite, pink and brown noise for focus, sleep or masking sound, with a timer.
SynthesizerA playable synth with two oscillators, filter, envelopes, LFO and effects, with MIDI keyboard support.
Tone GeneratorPlay any frequency as a sine, square, triangle or sawtooth wave, or sweep between two.

Tip & Bill SplitterWork out the tip and split a bill between people.
Tile CalculatorHow many tiles and boxes for a floor or wall, with grout gap and waste.
Concrete CalculatorConcrete for a slab, footing, column or steps in cubic metres or yards, and how many bags.
Gravel, Mulch & Soil CalculatorVolume and weight of gravel, sand, soil or mulch for an area and depth.

CSS Generator: Gradient, Shadow & RadiusGradients, box shadows and rounded corners with live preview and copy-ready CSS.
Colour ConverterHEX, RGB, HSL and OKLCH.
CSS Unit Converterpx, rem, em, vw and percent.
Colour Contrast CheckerWCAG contrast between two colours.

HTML Entities List & EncoderEvery named HTML entity with its codes, plus an encoder and decoder.
Cron Expression ExplainerA cron schedule in plain words, with the next runs.
Chmod CalculatorUnix file permissions in numbers and letters.
JSON Converter: YAML, XML, CSV & TOONConvert JSON to YAML, XML, CSV, TSV or TOON and back again, with indent, sorting, delimiter and type options.

Timer, Stopwatch & PomodoroCountdown, stopwatch and Pomodoro focus timer with presets.
Online NotepadA plain text notepad with several notes, saved only in this browser, with find and replace.
Random Number, Dice, Coin & TeamsFair random numbers, letters, dice, coin flips, teams and Secret Santa.
Spin the WheelPick at random from a list, or spin a yes or no wheel.

Reaction Time TestHow fast you react, averaged over five tries.
Dead Pixel & Monitor TestFull-screen colours and patterns to find dead pixels, check uniformity and see motion blur.
Webcam TestCheck your webcam works, its resolution and frame rate. Nothing is recorded.
Keyboard TesterPress every key to find dead keys, see key codes and check how many keys register at once.

Image Compressor & ConverterMake JPG, PNG and WebP files smaller, or convert between PNG, JPG and WebP, one image or a whole batch.
Image RedactionBlack out or blur parts of a screenshot.
Background RemoverCut the subject out of a photo with an AI model that runs on your device.
Meme, Caption & Quote MakerCaptions or free text on any image, or a quote set on a colour or a photo.

Password GeneratorStrong random passwords, passphrases and custom random strings, made on your device.
Encrypt & Decrypt Text or FilesLock text or a file with a password using AES encryption, and unlock it again.
WebRTC Leak TestChecks whether your browser exposes your real IP behind a VPN.
2FA Code GeneratorTime-based one-time codes from a setup key.

Fancy Text GeneratorBold, italic and script Unicode text for bios.
Emoji Copy & PasteEvery emoji by group, with search, skin tones, and the codes and meaning behind each one.
Word Counter & ReadabilityWords, characters, sentences and reading time, plus reading ease, grade level, long sentences and passive voice.
Citation Generator: APA, MLA, Chicago & HarvardReferences and in-text citations for web pages, books, articles and videos, with a bibliography you can sort and copy.

Email Signature GeneratorA clean email signature for Gmail, Outlook and Apple Mail.
UTM Link BuilderCampaign links with UTM tags.
Barcode GeneratorEvery common barcode: EAN, UPC, ISBN, Code 128, Code 39, ITF-14, GS1-128, Data Matrix, PDF417, Aztec and more, as PNG or SVG.
QR Code GeneratorQR codes for links, Wi-Fi and contacts, as PNG or SVG, with a transparent option.