97 web tools. One bookmark. Nothing leaves your browser.
verktoy.dev is a collection of small, fast tools for developers and everyday use: converters, formatters, validators, file and image utilities, and a set of Norwegian calculators you will struggle to find anywhere else. No account, no upload, no clutter.
Why this site exists
Most of these tools already exist somewhere on the web. The problem is that they exist on forty different sites, each with its own cookie wall, its own layout and its own idea of where the input field goes. You bookmark a JSON formatter, a regex tester, a unit converter and a base64 encoder, and then you cannot find the right bookmark when you actually need one.
So this is one place with one bookmark. Every tool shares the same layout, the same keyboard shortcut to search (Ctrl + K), the same dark mode, and the same habit of remembering your last input so you can pick up where you left off.
Everything runs locally
Almost every tool here is pure client-side JavaScript. When you compress an image, merge a PDF, convert a video, extract text with OCR or hash a password, the work happens inside your browser tab. The file is never uploaded, because there is no server to upload it to: the whole site is static files.
A handful of tools genuinely need the network: currency rates, DNS lookup, IP information, the HTTP and CORS testers, and the URL shortener. Those are marked with an External badge on the tool itself and in the tool list, so you always know before you paste something in.
What is inside
Converters
Unit conversion that does not make you hunt for the right field. Type a number, read every equivalent at once, and switch direction without clearing the form. Length, weight, temperature, area, volume, pressure, energy, frequency and data sizes are all covered, plus a currency converter using daily rates from the European Central Bank.
Temperature ·Weight converter ·Length & distance ·Bits & bytes ·Currency converter
Developer utilities
The formatters and testers you open a dozen times a day, without a signup wall. Format and validate JSON, test a regex against sample text with live match highlighting, decode a JWT to inspect its claims, diff two blocks of text, explain a cron expression in plain words, or generate UUIDs and hashes.
JSON formatter ·Regex tester ·JWT decoder ·Text diff ·Cron helper ·UUID generator
Files, images and media
File tools that never upload your file. Image compression, format conversion, favicon generation, PDF merging and splitting, OCR text extraction, audio conversion and trimming, video compression and video-to-GIF all run inside the browser tab using WebCodecs, Canvas and WebAssembly. Your file stays on your machine.
Image converter & compressor ·PDF tools (split & merge) ·Favicon generator ·OCR, image to text ·Video compressor
Everyday calculators
Small calculations that are annoying to do in your head and overkill for a spreadsheet: percentages and discounts, loan repayment for both annuity and serial loans, compound interest on savings, BMI, blood alcohol by the Widmark formula, week numbers and pregnancy due dates.
Percentage calculator ·Loan calculator ·Savings calculator ·Week number ·Due date (pregnancy)
Norwegian and Nordic tools
This is the part you will not find on the big international tool sites. Norwegian VAT at 25, 15 and 12 percent. Withholding tax straight from Skatteetaten’s own official table routine. Document duty on a property purchase. One-off vehicle registration tax at 2026 rates. Holiday pay, parental benefit, daycare fees with sibling discounts, customs on imports, postcode lookup and public holidays. Validators and generators for national ID numbers, KID numbers, organisation numbers and bank account numbers for Norway, Sweden and Denmark.
VAT calculator (Norway) ·Tax table (withholding) ·Property stamp duty (Norway) ·Norwegian national ID ·Public holidays