DIMAS' TOOLBOX
Small, useful tools that just work. No sign-up, no subscription, no “upgrade to continue” — the way this stuff should have stayed all along.
Pick a tool
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Popular tools
QR Code Generator
Turn a link or a line of text into a QR code. Pick a size, pick a color, download it.
Tax Percentage Calculator
Find the tax rate from a total and the tax paid, or from pre-tax and post-tax amounts.
BMR Calculator
Calculate Basal Metabolic Rate and TDEE with the Mifflin-St Jeor formula.
Currency Converter
Convert an amount between two currencies using an exchange rate you enter.
Time Zone Converter
Convert a date and time between two time zones and see the UTC offset.
Average Calculator
Find the mean, median, mode, and range of a list, or an average per day, week, or month.
Date Difference Calculator
Find the days, weeks, months, and years between two dates.
Time Calculator
Add or subtract hours and minutes from a clock time, or add and subtract durations.
CSS Gradient Generator
Build linear, radial, and conic gradients and copy the CSS.
CSS Animated Glowing Border Generator
Build a rotating conic-gradient border that chases around a card, with adjustable speed, thickness, and glow blur.
Password Generator
Random passwords with the length and character set you choose.
PDF Merge & Organize
Combine PDFs, reorder, rotate, or drop pages, then download the result.
Image Compressor
Shrink JPG, PNG, and WebP file size in the browser, nothing uploaded anywhere.
New this week
Changelog →CSS View Transitions Generator
Build View Transitions animations (crossfade, slide, cover, zoom, blur, wipe, circle reveal) with a live preview, and copy the CSS, HTML and startViewTransition script.
CSS Holographic Foil Card Generator
Build a holographic trading-card foil effect with a rainbow, gold or silver sheen and cursor-following glare, then copy the CSS, HTML and script.
CSS Selector Tester
Test a CSS selector against pasted HTML: see matched elements, the match count, and the selector's specificity.
Browse by category
Finance, math, date, and everyday calculators.
View all →Data formats, encoding, regex, and code utilities.
View all →Counting, formatting, cleanup, and cipher tools for text.
View all →Passwords, random data, names, QR codes, and barcodes.
View all →Merge, split, convert, and extract from PDFs and documents.
View all →Color pickers, palettes, and CSS generators.
View all →Convert, compress, edit, and analyze images.
View all →What's in here
Dimas' Toolbox is a growing set of free online tools for the small jobs that shouldn't need an account: a QR code generator and scanner, a set of PDF tools to merge, split, and convert files, browser-based image tools to compress, convert, crop, and watermark photos, and a JWT decoderfor pulling apart tokens. More utilities get added as they're built.
Every tool runs entirely in your browser — nothing you upload, type, or generate is sent to a server. No sign-up, no subscription, no file limits, no watermarks on the output. Just open the tool you need, use it, and close the tab.