I'm a software engineer, and I wanted to see if a full PDF and image toolkit could run entirely in the browser. The result is iEditPDF, a free set of PDF and image tools that process files on your own device. Here's how it works and what I learned.

Why client-side processing?

Uploading files creates three problems:

• Privacy: sensitive documents sit on servers you don't control.

• Speed: large scans take minutes to upload before anything happens.

• Limits: servers cost money, so tools add daily caps, watermarks and paywalls.

Running the work in the browser removes all three. The heavy lifting is done with WebAssembly, HTML5 Canvas and Web Workers, so the page stays responsive while a large file is processed.

The Privacy Vault

When you finish a task, the output is saved in a local Privacy Vault in your browser's IndexedDB storage, not on a server. You can see the files you've created or changed, reopen them, and send them into the next tool without re-uploading anything.

Because it's local, there's no account, no database of your documents, and no bandwidth to pay for. The trade-off is that browser storage isn't a permanent archive, so download any file you want to keep.

Tool chaining

Real document work is rarely one step. A typical job might be: scan pages, merge them, compress the result, then password-protect it. On most sites that means downloading and re-uploading between every step.

In iEditPDF you can move a file from one tool straight into the next from the vault. For example:

1. Merge your PDFs

2. Compress the merged file

3. Protect it with a password

No intermediate downloads, and the file never leaves your browser.

Batch processing

Need to resize or compress a whole folder of photos? Add many files at once, choose your settings one time, and iEditPDF applies the same settings to every file. For example, upload 50 images to Compress Image, set a 100KB target, and download all results as a single ZIP.

One thing to know: because everything runs on your own device, batch speed depends on your hardware. A phone will take longer than a laptop for 50 large photos, and very large batches can use a lot of memory. For big jobs, process in groups of 10-20 files.

Smart suggestions

When the vault contains a PDF, iEditPDF suggests the Protect PDF tool. Documents like payslips, bank statements and contracts are often shared by email, so encrypting them before sending is a good habit.

Custom file naming

Generic names like output (3).pdf get messy fast. You can name files yourself before you download, for example AadhaarCopy_Vipul_Signed.pdf, which is handy for exam portals and office submissions.

A real studio experience, for PDFs and images

The tools aren't just a form with a button. Both the PDF and image tools use a live canvas preview, so you see every change as you make it, before you download anything.

• Edit PDF: click existing text, draw or type a signature, whiteout mistakes and fill forms, with multi-page thumbnails.

• Compress Image: a real-time before/after comparison while you dial in a target size like 20KB or 50KB.

• Resize, crop and watermark: adjust size, selection, opacity and position on the canvas and see the result immediately.

Because the preview is drawn with HTML5 Canvas in your browser, it updates instantly with no round trip to a server.

Notes Maker for students

Students asked for something beyond converting files, so I added Notes Maker. It has more than 10 presets, including UPSC class notes, so you can start from a layout that fits how you study instead of a blank page.

• Write multi-page notes, formula sheets and revision material.

• Export to Markdown or PDF.

• Works completely offline once the page has loaded.

Like the rest of the toolkit, notes are stored in your browser's IndexedDB, not on a server. That keeps them private, but it also means they can be lost if the page is refreshed or site data is cleared. Export to PDF or Markdown when you finish a session.

Tools built for real Indian use cases

Government and exam portals often reject files that are even 1KB over the limit. That's why the toolkit includes exact-size compression:

• Compress images to 20KB, 50KB, 100KB or 200KB

• Resize a signature to 140x60 px

• Make passport photos with a clean white background

What I learned

• Browser memory limits are real: very large files need careful chunking.

• Web Workers are essential, or the UI freezes.

• Users care about privacy more when they understand that "upload" means "sent to a server".

• Batch jobs are limited by the user's device memory, so I process files one at a time and package them into a ZIP at the end.

• Local-only storage is great for privacy, but you have to be upfront that it isn't a backup.

Try it

Everything is free, with no sign-up or watermarks, and batch mode handles dozens of files at once. You can browse all the tools at iEditPDF. If you want to know exactly how files are handled, read the security statement.

If you have feedback or feature ideas, drop a comment. I'd love to hear what you'd add next.