👨💻Developer morning
Debug the token, prove the regex, ship the export — before standup.
Fast, private calculators and utilities that run entirely in your browser — no upload, no account, nothing leaves your device. Built by the team behind LENS.
Every tool shows you exactly how it works 👇
Pick your stack
Debug the token, prove the regex, ship the export — before standup.
The cron that ran 60 times, and the timestamp in the wrong unit.
Steal the palette, get the shadow right, feel the easing.
Post is due in 10 minutes and the photo is horizontal.
That photo knows your address, and that text has invisible junk.
Three PDFs, one deadline — and nothing gets uploaded.
Add or remove VAT at any rate — see net, VAT and gross instantly.
Amount, rate and term → monthly payment, total interest and total repaid.
Property price, deposit, rate and term → monthly payment and interest.
What is money from the past worth today? See how inflation eats value.
Estimate FBA fees by size & weight — and see your real profit per unit.
Cost + price → profit, profit margin % and markup %. Or price from a target margin.
Type 12–13 digits → a valid scannable barcode. Download SVG or PNG.
Check an EAN, UPC or GTIN check digit and see the correct one.
Build consistent product SKU codes from brand, category, colour and size.
Find the ratio and resize images or video to a new size without distortion.
HEX ↔ RGB ↔ CMYK ↔ HSL with a live swatch. Built for web and print.
Any link or text → a QR code with your logo. Download PNG or SVG.
Will your photo print sharp? Max size and DPI for 30×40, A4, A3, A2.
How many A4 (or any size) fit on A1 or any sheet — with a layout preview.
Size × price per m² + options → total and cost per piece. Banners, signage.
Piece size and roll width → linear metres of vinyl, film or banner, and waste.
Finished size + bleed → document size, safe area and a visual print guide.
Drag the light source → soft layered box-shadow and clean CSS. Not one muddy blur.
Drop an image — get its dominant colours as ready CSS variables, Tailwind or JSON, with contrast checks.
Drag the easing curve and race it against ease and linear side by side — the only way to judge motion.
Drag the before/after wipe to see what compression really costs — real KB saved, PNG/JPG/WEBP.
Fit any horizontal photo into 9:16 Stories with a blurred background — nothing cropped.
Click the background → transparent PNG. For logos and product shots, nothing uploaded.
See the GPS, camera and serial number hidden in your photo — then download a clean copy.
Grab the exact frame at the video's full resolution — not a screenshot of your screen.
How many tiles and boxes you need for a room, including waste for cuts.
Wall area and coats → litres and cans of paint, minus doors and windows.
Slab or footing size → concrete volume (m³) and the bags you need.
Room size and roll size (with pattern repeat) → rolls of wallpaper.
Slab size and spacing → reinforcement bars, total steel and stock bars.
Room size and pack coverage → packs of laminate flooring, with waste.
Current and cable run → minimum cable size (mm²/AWG) and voltage drop.
Any two of volts, amps, ohms or watts → the other two, instantly.
Capacity, voltage and load → how many hours a battery will run.
Decode a token, read the payload and see if it expired — 100% offline, never uploaded.
Combine PDFs, extract or delete pages — offline. Your file never leaves the browser.
Live match highlighting on your own text, capture groups and a clickable cheat sheet.
Convert data between JSON, CSV, TSV, YAML, SQL and Markdown — with a real RFC 4180 parser. Nothing uploaded.
A real multi-size favicon.ico written byte by byte, every PNG size, and the HTML to paste.
Cron in plain English plus the actual next run times — catches the every-minute mistake before you deploy.
Epoch to date in UTC, your zone and anywhere else — auto-detects seconds vs milliseconds.
Press keys and see them light up — find dead, stuck or repeating keys instantly.
TBW and your real write volume → years left. Also reads the wear percentage from your SMART data.
Camera preview, live level meter and playback — sort it out before the call, not during it.
More tools every week — design & print, photo, finance, construction and AI.