What do you need?

Run your gear through the same checks a technician would, right in the tab you already have open.

• Keyboard TesterTest every key on your keyboard in the browser. See which switches register, catch ghosting, check 100%, 80%, 75%, 65% and 60% boards in ANSI, ISO or AZERTY.
• Dead Pixel TestCycle full-screen colours to find dead or stuck pixels on any monitor, laptop screen or phone display, with no app install required.
• Chinese Keyboard TesterTest every key on a Chinese keyboard and check your Pinyin or Zhuyin input method really produces characters. Covers Bopomofo caps and all five board sizes.
• Hindi Keyboard TesterTest a Hindi keyboard in your browser. Check every switch, confirm an InScript layout is applied, and see whether Devanagari really reaches the box.
• Arabic Keyboard TesterTest an Arabic keyboard in your browser. Check every switch, confirm the Arabic layout is live, and see whether letters join and run right to left.
• Russian Keyboard TesterTest a Russian ЙЦУКЕН keyboard in your browser. Check every switch, confirm the Cyrillic layout is live, and find keys producing the wrong letter.
• Click Speed Test (CPS)Measure your clicks per second in the browser. Pick a duration from one to a hundred seconds and see exactly how your click speed compares.
• Mouse TesterTest mouse buttons, scroll wheel, double-click speed and polling rate in the browser before you blame a bad match on your hardware.
• Reaction Time TestMeasure your reaction time over five rounds and compare your average against typical human reaction speeds — no download, no account, just your browser.
• Spacebar CounterCount how many times you can hit the spacebar against the clock. The same clicks-per-second test, narrowed to a single key — no mouse, just the space bar.
• Gamepad TesterTest your PS5, Xbox or USB controller in the browser — check every button, both sticks for drift, the analog triggers and the d-pad before you blame a game.
• Mic Test (Microphone Test)Check your microphone with a live waveform before a call or a stream. The audio is read live in your browser and isn't recorded or uploaded.
• Webcam Test (Camera Test)Test your webcam with a live preview in the browser, and see the resolution and frame rate your camera is really sending. Nothing is uploaded.

Pick a duration and go — every timer here works without an account or an app.

• StopwatchFree online stopwatch with lap and split times, accurate to the hundredth of a second, that keeps counting correctly if you switch tabs or lock your screen.
• Pomodoro TimerA 25-minute Pomodoro focus timer with automatic breaks, an alarm, and a running tally of completed sessions, no account needed.
• Countdown TimerSet a custom countdown to any length with an alarm at zero — from a one-minute egg timer to an hour-long study block you can bookmark.

Paste it in, work on it here, and take it away again — it never leaves your device.

• Word CounterCount words, characters and reading time as you type, with limits for Twitter/X, Instagram bios and other platforms built in.
• Case ConverterConvert text to UPPERCASE, lowercase, Title Case or Sentence case, and to camelCase, snake_case or kebab-case for code — instantly, in your browser.
• Text CompareCompare two blocks of text line by line and see exactly what was added, removed or changed — the comparison runs on your own device.
• Online NotepadA plain text notepad in your browser tab that saves as you type and is still there after a reload, with word counts and a .txt download.
• Text to Speech (Read Aloud)Paste text and hear it read aloud — no sign-up, no character limit. The voice picker marks which voices run on your device and which send text to a server.

No ceremony, no accounts — paste in, get the formatted or encoded result back.

• Base64 Encoder / DecoderEncode and decode Base64 text and files instantly, entirely client-side, with no upload and no size limit imposed by a server.
• JSON FormatterFormat, validate and beautify JSON in the browser with inline error locations — what you paste is parsed on your own device rather than sent to a server.
• UUID GeneratorGenerate random v4 UUIDs and GUIDs in bulk, copyable individually or as a list, computed locally in your browser with no server round-trip for a single one.
• Epoch Converter (Unix Timestamp)Convert Unix epoch timestamps to dates and back in seconds or milliseconds, with UTC and your local time side by side, and Discord markup as output.
• HEX to RGB ConverterConvert HEX, RGB, HSL and OKLCH in any direction as you type, with 8-digit alpha support and a live swatch — every conversion runs in your own browser.
• Color PickerPick a color from any image in your browser, or straight off the screen where your browser allows it — with the value in four formats and a palette you keep.

Everything here is generated client-side, so a generated secret stays a secret.

• Password GeneratorGenerate strong random passwords or memorable passphrases with adjustable length, character sets and an entropy estimate, computed only in your browser.
• QR Code GeneratorTurn text, links or Wi-Fi details into a downloadable QR code, generated in your browser with no sign-up and no watermark.
• Barcode GeneratorGenerate Code 128, EAN-13, UPC-A and Code 39 barcodes in your browser. Check digits are worked out for you, and every barcode downloads as PNG or SVG.
• Signature GeneratorDraw a signature with your mouse or finger, or type one in a handwriting font, then save it as a transparent PNG or SVG. Nothing is stored.

Run the numbers on a listing before you price it, and keep a dated record of what you worked out and why.

• Etsy Fee CalculatorWork out what Etsy really takes from a sale: listing, transaction, payment processing and Offsite Ads fees, plus your payout, profit and margin.
• eBay Fee CalculatorWork out eBay's final value fee, per-order fee and your real profit on a US sale — including the fee eBay charges on the shipping you collected.
• Amazon FBA Fee CalculatorWork out Amazon US referral and FBA fulfillment fees from your price, box size and weight, then see the size tier, net proceeds and profit margin.
• PayPal Fee CalculatorWork out PayPal's US fee on any payment, then reverse it to find what to charge so the amount you need actually lands in your account.
• Age CalculatorEnter a date of birth and get an exact age in years, months and days, the total days and weeks lived, and how long there is until the next birthday.

Drop a file in, get a converted one back — the conversion happens on your device.

• Image ConverterConvert images between JPG, PNG and WebP entirely in your browser, with no upload — pick a quality, a background color, and download the result.
• YAML to JSON ConverterConvert YAML to JSON in your browser — paste a config or drop a .yaml or .yml file, and the parsing happens on your device, not on a server.
• Bank Statement Converter (PDF to CSV)Convert a text-based bank statement PDF to CSV in your browser. Scanned statements are refused, not guessed at; only your saved column layout is uploaded.
• Merge PDF (Combine PDF Files)Combine PDF files into one document in your browser. Reorder the pages before you merge — nothing is uploaded and no sign-up is asked for.
• Split PDF (Extract Pages)Split a PDF into separate files by page range, in your browser. Extract just the pages you need — nothing is uploaded and no sign-up is asked for.
• PDF to JPG (and PNG)Convert PDF to JPG or PNG in your browser, one image per page at screen, normal or print resolution. The PDF never leaves your device.
• JPG to PDF (and PNG)Convert JPG to PDF in your browser — combine several images into one file at A4, Letter or a page sized to match each. The images are never uploaded.