Most of a developer's week isn't spent writing algorithms — it's spent on small, repetitive jobs: shrinking an image before a commit, turning a PDF into something a client can annotate, generating a password for a new service account. None of these tasks are hard on their own, but doing them one file at a time, on a website that uploads your files to a server you don't control, adds up. Here are ten browser-based tools worth keeping bookmarked, organized by the kind of work they replace.
1. Bulk image compression
Unoptimized images are still one of the most common causes of a slow page. Before you commit an image to a repo or upload it to a CMS, running it through a bulk image compressor that processes a whole folder at once, rather than one file at a time in an image editor, turns a five-minute chore into a five-second one.
2. Format conversion (HEIC, WebP, PNG, JPG)
iPhone photos save as HEIC, design tools export WebP, and older systems still expect JPG or PNG. Rather than installing a codec or opening each file in Photoshop, a browser-based HEIC to JPG converter or WebP to PNG converter handles the whole batch and keeps every file on your machine.
3. PDF merging and splitting
Combining a cover letter, a contract, and a set of scanned signatures into one document — or pulling three pages out of a fifty-page report — comes up more often in ordinary project work than most people expect. A PDF merger and PDF splitter that run locally mean you're not uploading a signed contract to a random server to do it.
4. QR and barcode generation from a spreadsheet
If you need one QR code, any generator will do. If you need three hundred — one per product, one per event ticket, one per inventory item — you need something that reads a CSV and produces the whole batch in one pass. Our QR code generator and barcode generator both support bulk mode for exactly this.
5. Password generation for service accounts
Spinning up a new database, API key, or staging environment usually means typing a password into a field somewhere. A password generator that runs in your browser (via the Web Crypto API, not a server call) means the password never travels anywhere before you paste it in.
6. Stripping EXIF metadata before sharing screenshots
Screenshots and photos carry more than pixels — camera model, GPS coordinates, and timestamps ride along in the file's metadata. Before sharing a photo publicly or attaching one to a bug report, an EXIF stripper removes that metadata without touching the image itself.
7. Building a quick invoice
Freelance and contract work eventually means sending an invoice, and a generic word-processor template rarely looks as clean as a purpose-built one. A browser-based invoice generator that calculates totals and tax automatically and exports straight to PDF removes the arithmetic from the process.
8. Shortening and tracking links
Long URLs are awkward in documentation, README files, and support tickets. A URL shortener that also reports click counts is useful for tracking which link in a changelog or announcement actually gets used.
9. Business math you don't want to get wrong by hand
Pricing a feature, estimating an hourly rate, or working out a discount and tax total are simple calculations that are still easy to fumble under time pressure. Purpose-built calculators — a profit margin calculator, a freelance rate calculator — remove the arithmetic mistakes that spreadsheets quietly introduce.
10. A resume or CV that doesn't fight you in Word
Margins that shift when you add one more bullet point are a familiar frustration in any word processor. A dedicated CV maker keeps the layout fixed while you edit the content, and exports directly to a print-ready PDF.
The common thread
None of these are complex tools individually. What they have in common is that they run entirely in your browser: no file leaves your device, there's no account to create, and there's no daily limit that turns a genuinely bulk job back into a one-file-at-a-time chore.