Everything in the catalog

Given a flour weight, converts hydration and other baker's percentages into gram amounts, locally in your browser.

Bulk image resizer, cropper and converter that processes pictures in the browser.

Calculates Dutch net pay including loonheffing, holiday pay and labour credit.

Estimates net income for a Spanish autónomo after social security and tax.

Calculates Spanish personal income tax by bracket.

Computes the extra pay installments and their effect on monthly pay.

Calculates the IRPF withholding rate on a salary.

Produces an Instagram caption and about ten hashtags in a chosen tone.

Build line, bar, bubble, pie, donut, scatter and radar charts that are drawn locally in the browser.

Converts CSV files to JSON after a preview of headers and sample rows, processed client-side.

Minimalist habit tracker with streaks, streak freezes and a consistency map that works offline from browser cache.

Decodes Base64, Gzip and JWT tokens and formats the JSON inside, all client-side.

Fill a grid and set column alignment to get a Markdown table, with offline use and no uploads.

Simple daily to-do list that compares you with yourself yesterday, keeping data in local storage.

Converts PNG and JPG files to smaller WebP files in the browser at the same dimensions.

Invoices, quotes, purchase orders and credit notes with autosave, no account and local processing.

Calculates net pay for a Polish umowa o pracę after ZUS, health and PIT.

Shows EXIF and file metadata for photos and PDFs and says it reads them in the browser.

Views, edits and strips EXIF data from images, with files kept local per the page.

Turns a PNG into a favicon.ico and the standard set of app icon sizes in the browser.

Twelve finance calculators in GBP, including compound interest, savings goal and mortgage, that work offline.

Resizes images to set pixel dimensions or a target size in KB without upload.

Meta tag generator in a 100+ tool site that also has keyword density, sitemap, robots.txt and Open Graph tools.

Builds campaign links and validates UTM parameters against GA4 rules to catch attribution mistakes.