Every file you touch here stays on your machine.
PDF, image, developer, SEO, text, student and business tools — all free, all entirely in your browser. No upload, no account, no server ever sees your data.
The toolset
Focused tools covering the everyday PDF work — pick one to get started, no account needed.
How this actually works
Each tool runs entirely with JavaScript already loaded in this page — PDF tools via pdf-lib and pdf.js, image tools via the browser's native Canvas API, and everything else with plain JavaScript. Your files or input are read into browser memory, processed, and handed back as a download or copyable result. This page itself is served by a small Laravel route; Laravel never sees your files either. The only backend in use is Supabase, and only for two optional things: signing in with a magic link, and — only if you're signed in — a log of which tool you ran and when. Two things have real limits worth knowing up front: Compress PDF flattens each page to a re-encoded image (great for scan-heavy PDFs, not ideal if you need selectable text after), and Word/Excel/PowerPoint ⇄ PDF conversion genuinely requires a server-side rendering engine, so it isn't included here — this build only ships tools that can honestly run client-side.
Questions people actually ask
Can I choose the order the files merge in?
Yes — drag files up or down in the list before merging; they combine top to bottom in whatever order you set.
Is there a limit on how many PDFs I can merge?
No hard limit — the practical ceiling is your device's available memory, not a server quota.
Can I merge PDFs that have different page sizes?
Yes — each page keeps its own original size and orientation; merging combines files, it never resizes or crops pages to match each other.
Does merging reduce quality?
No — pages are copied into the new file exactly as they were, not re-rendered or recompressed. If you also need a smaller file, run the result through Compress PDF afterward.
Can I remove a file after adding it, before merging?
Yes — every file in the list has its own remove button, so you can adjust the set before running the merge.
Can I merge a password-protected PDF?
Not directly — a password-protected file needs its password removed first, since the tool can't open an encrypted PDF to read its pages.
What happens to links and bookmarks after merging?
Bookmarks and bare page content carry over, but internal links that pointed to a specific page number in the original file may no longer point to the right page once everything is renumbered into one document.
Do I need to convert images or other files to PDF first?
Yes — this tool merges existing PDFs only. For photos or images, use JPG/PNG to PDF or Scan to PDF first, then merge the result in with the rest.
Will page numbers continue across the whole merged file?
Yes — the merged PDF is one continuous document; page 1 of the second file becomes whatever page number comes next after the first file ends.
Can I merge PDFs on my phone?
Yes — the same drag-to-reorder list and merge process works in a mobile browser, no app required.
Is there a file size limit?
No hard limit — very large combined files just take longer and use more of your device's memory, since there's no server involved to offload the work to.
Can I add the same file twice by mistake?
No — a file with the same name and size as one already in the list is automatically skipped as a duplicate, so you can't accidentally merge two copies of the same document.
What is the merged file named?
merged.pdf by default — rename it after downloading if you want something more specific.
Is this really free, and is there a file size limit?
Yes — no account, no paywall. Since processing happens in your browser's memory rather than uploading anywhere, the practical limit is your device's available RAM, not a server quota. Very large files (500+ pages) may run slower, especially for Compress and PDF→JPG.
Does anything about my file get sent anywhere?
No. Every tool runs with pdf-lib/pdf.js loaded in this page; your file is read into browser memory and never leaves it. The only network call this app makes for your account is Supabase auth — and that only stores which tool you ran and when, never file content.
Why isn't Word/Excel/PowerPoint → PDF included?
Converting Office formats accurately needs a real rendering engine (what Word or LibreOffice use internally) — no browser library does this reliably. Rather than ship a broken version, it's left out.
Does TechDriven Tools have OCR (text recognition)?
Yes — OCR PDF recognizes text in scanned or photographed pages using Tesseract.js, running entirely on your device, and gives you a searchable PDF or a plain text file. Nothing is uploaded for this either.
Can I use this without an internet connection?
Once the page and its libraries have loaded once, yes — the tools themselves need no network access. Signing in and viewing history do require a connection, since those talk to Supabase.
What happens to the "history" if I sign in?
Only a row per tool run — the tool's name and a timestamp. No filename, no file content, ever. You can see the full list any time via the History button.
Are the non-PDF utilities (password generator, JSON formatter, etc.) private too?
Yes — same rule as the PDF tools. Word Counter, Case Converter, Password Generator, UUID Generator, Base64, Hash Generator, JSON Formatter and JWT Decoder all run with plain JavaScript already loaded in this page; nothing you type or paste is sent anywhere.
Merge PDF, in depth
100% free, browser-only, no registration, works on mobile, unlimited files.
Features
Drag-to-Reorder
Arrange files in exactly the order they should appear before merging.
Any Page Size
Combines pages as-is — no forced resizing or cropping.
Unlimited Files
Add as many PDFs as your device can handle in one go.
No Quality Loss
Pages are copied exactly, never re-rendered or recompressed.
Instant
No server round-trip, so there's no upload wait.
Private by Design
Every file stays on your device throughout.
Works on Mobile
Same tool, same interface, on a phone browser.
Free Forever
No account, no page limit, no watermark.
Why use Merge PDF
- Combine multi-part documents — scanned chapters, signed pages, multiple reports — into a single file to share or archive.
- Assemble an application packet from separate forms, IDs, and certificates.
- Consolidate receipts or invoices into one file for expense reporting.
- Turn several single-page scans into one properly ordered document.
- Avoid sending five separate attachments when one file will do.
- Keep a single source of truth instead of a folder full of loose PDFs.
Supported uses
Multi-Part Reports
Signed Contracts & Forms
Application Packets
Invoices & Receipts
Scanned Book Chapters
Combined Certificates
How TechDriven Tools compares
| Feature | TechDriven Tools | Other Online Tools | Desktop Software | Command-Line Tools |
|---|---|---|---|---|
| Speed | Instant, no upload | Depends on upload speed | Depends on install | Instant, but needs setup |
| Privacy | Never leaves your device | Varies — check the site's policy | Local, but often needs install/updates | Local, fully offline |
| Installation | None — runs in browser | None | Download & install required | Requires tools installed first |
| Mobile-friendly | Yes | Varies by site | No | No |
| Free | Always | Often freemium / capped | Often paid | Free, but not beginner-friendly |
| File limits | None beyond device memory | Often capped (e.g. 5 files free) | Varies | None |
| Ease of use | Drag and drop | Drag and drop | Menu-driven | Typed commands |
Privacy
- Files are never stored — nothing is written to a server, ever.
- All processing happens in your browser, using pdf-lib.
- No registration or account required to use any of this.
- Nothing is transmitted, so there's nothing in transit to intercept.
- Downloads come straight from your browser's own memory to your device.
What is PDF Merging
Merging combines two or more separate PDF files into a single document, page order preserved exactly as you set it. It's the digital equivalent of stapling separate printouts together, except the result stays a real, searchable, shareable PDF rather than a stack of paper.
Benefits
The main benefit is consolidation: instead of five separate attachments, a recipient gets one file, in the right order, that opens the same way everywhere. That matters most when a document naturally exists in parts — a signed contract scanned page-by-page, a report with separately-generated appendices, a set of invoices for one expense claim — and needs to travel and be read as a single, complete unit.
Best Practices for Merging PDFs
- Rename files with a number prefix (01-cover, 02-body, 03-appendix) before uploading — it makes the initial list easier to sort even before you drag anything.
- Check each source file individually first if something looks wrong afterward; a blank or corrupted page in the output almost always traces back to the same page being blank or corrupted in one of the originals.
- Merge in the order you want to read the file, not necessarily the order you happened to save the files in.
- If the combined file needs to be smaller for email, run it through Compress PDF after merging — it catches everything in one pass.
Common Mistakes
The most common mistake is assuming the file list's upload order and the merge order are the same thing — they're not. The upload order is just whatever order files were selected or dropped in; the actual merge order is whatever the list shows at the moment you click Run. The second is expecting merging to also compress or clean up the files — it doesn't touch content or quality at all. If the goal was a smaller file, Compress PDF is the tool for that, used either before or after merging.
File Size After Merging
There's no compression step here — the merged file's size is approximately the sum of the original files' sizes, since pages are copied in as-is rather than re-encoded. A merge doesn't make anything smaller or larger beyond that arithmetic; if the combined file needs to hit a specific size for an email attachment limit, that's a job for Compress PDF, run separately.
Security
Since every file involved is read directly into your browser's memory and never uploaded, merging a batch of contracts, ID scans, or financial statements together carries the same privacy profile as opening them locally — nothing about the process introduces a new place for that content to be stored or exposed.
Mobile Merging
The same drag-to-reorder list works with touch as well as a mouse — press and hold a file, drag it to its new position, and let go. There's no reason to email yourself files from a phone just to merge them on a laptop later; the whole process works in one mobile browser tab.
Business and Education Use Cases
In an office, this is the tool for assembling a single expense report from several receipts, combining a contract with its signed signature page, or building one packet from forms collected separately. In education, it's combining a multi-part assignment, merging scanned worksheet pages into one file for a gradebook upload, or putting together a reading pack from several separate handouts — all without installing anything on a shared computer.