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
What does the generated cover letter include?
Your contact details, the date, the company/role you're applying to, a greeting (to a named hiring manager or a general one), and body paragraphs built from the key points you provide.
Does it write the content for me?
It assembles a structured letter from what you tell it — your key points, achievements, and why you're interested — rather than generating content with AI. You write the substance; this handles the structure and formatting.
Can I customize it after generating?
The output is a downloadable PDF — for further edits, regenerate with updated form fields, since the PDF itself isn't directly editable in this tool.
What if I don't have a hiring manager's name?
Leave that field blank — the letter uses a standard general greeting ("Dear Hiring Manager") instead.
Does it save my cover letter anywhere?
No — nothing is stored. Download the PDF when you're done; there's no account or history to return to.
What file format does it download as?
A PDF, generated entirely in your browser using pdf-lib — the same engine behind this site's Resume Builder and Invoice Generator.
Can I generate more than one for different jobs?
Yes — just change the company, role, and key points and generate again; there's no limit.
Is my information sent anywhere?
No — the PDF is generated entirely in your browser; nothing you type is transmitted.
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.
Cover Letter Generator, in depth
Fill in a simple form and generate a structured, downloadable PDF cover letter — you write the substance, this handles the format.
Features
Structured Layout
Standard cover letter format, assembled automatically.
Your Own Key Points
You provide the achievements; the tool structures them.
Named or General Greeting
Address a specific hiring manager, or fall back to a standard greeting.
Real PDF Output
Generated with pdf-lib, ready to attach.
Why use Cover Letter Generator
- Produce a properly structured cover letter without starting from a blank page.
- Generate a new letter for each application quickly, once you know the format.
- Avoid generic-sounding structure mistakes a first draft often has.
- Keep your application details private — nothing is stored on a server.
Structure vs. content
A cover letter's shape is predictable — greeting, why this role, a couple of concrete reasons you're a fit, a closing ask — and that structure is what this tool builds reliably. It deliberately doesn't generate your achievements or reasons for interest with AI; you provide your own key points, and the tool assembles them into the right format.
What makes the result specific instead of generic
The output is only as specific as what you put in — a real achievement with a number, and something true about the company or role, make a far stronger letter than generic phrases would, regardless of how well-structured the letter is.
From our blog: How to Write a Cover Letter That Doesn't Sound Generic