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Popular tools
The highest-demand tools with full options — browse by category below for the rest.
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. Honest limits worth knowing: Compress PDF flattens each page to a re-encoded image (great for scans, not ideal if you need selectable text after); HEIC conversion depends on your browser (Safari usually works; Chrome often cannot decode HEIC without a library we don't ship); Fill PDF Form is best-effort for simple AcroForm fields, not a full Adobe Forms replacement; and Word/Excel/PowerPoint ⇄ PDF genuinely needs a server-side engine, so it isn't included — this build only ships tools that can honestly run client-side.
Questions people actually ask
What format is the output?
Always JPG — the compression works by re-encoding the image, which is what makes the size reduction possible. If your source has transparency (a PNG), that transparency is lost, since JPG doesn't support it.
What quality setting should I use?
70% is a reasonable starting point for most photos — visually close to the original at a meaningfully smaller size. Drag the slider lower for more savings, or higher if you start seeing visible artifacts.
Can I compress a PNG?
Yes — it's read in as whatever format it is and re-encoded as JPG, same as a JPG input. Just remember any transparency in the PNG won't survive the conversion.
Does it resize the image, or only compress it?
Only compression — the pixel dimensions stay exactly the same. This tool controls file size via quality, not by shrinking the image itself.
How much smaller will my file get?
Depends on the image and the quality you choose — a detailed photo shrinks less than a simple graphic at the same setting. The result message shows the exact before-and-after size once it's done.
Can I compress more than one image at once?
Not in one run — this tool works on one image at a time. Run it again for additional images.
Is my image uploaded anywhere?
No — it's decoded and re-encoded entirely in your browser using the Canvas API; nothing is uploaded.
Can I undo the compression?
No — like any lossy compression, it's one-way. Keep your original file if you might need the uncompressed version again.
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.
Image Compressor, in depth
Image Compressor shrinks JPG/PNG/WebP file size with a quality-oriented pass for email and CMS uploads without leaving the browser.
How Image Compressor works here
Image Compressor runs locally in your browser on TechDriven Tools. Inputs stay on your device — nothing is uploaded for this step.
Read every label before running. For Image Compressor, the controls that change outcomes most are: quality/size trade-off for the uploaded image. Change one control at a time when you are comparing results.
When to use it
Use Image Compressor when the job matches what the tool is named for — not as a generic substitute for unrelated PDF or data tasks.
Prefer this browser version when the input is sensitive and you want processing to stay on-device with clear option names like: quality/size trade-off for the uploaded image.
If the next step differs (for example you finished and now need a sibling utility), jump to a related tool instead of forcing one screen to do everything.
Teams standardize on Image Compressor when the alternative is emailing files to a consumer upload site. Document the preferred option defaults (for example the usual quality, corner, or rate) so everyone reproduces the same result.
If Image Compressor is only one step in a pipeline, write the order down: what happens before, what happens after, and which related tool owns each step. That prevents double-processing and accidental quality loss.
On mobile, prefer moderate file sizes and simpler option combinations. Local processing is powerful, but phones have less memory than desktops for huge scans or megapixel images.
CMS featured images. Shrink a 6MB phone photo before WordPress upload limits complain.
Chat attachments. Compress screenshots so messaging apps do not re-crush them unpredictably.
Portfolio previews. Make lighter derivatives while keeping originals elsewhere.
Options that change the result
Primary controls
The important controls are: quality/size trade-off for the uploaded image. Change one at a time when comparing outcomes so you know what improved the result.
Run and verify
After you run Image Compressor, open or inspect the output on the device where you will share it. Keep originals until that check passes.
Boundaries
This page does not replace desktop suites for heavy Office conversion or certified legal e-sign. It covers the focused job described above.
Practical defaults
Start with conservative defaults on Image Compressor, run once, then adjust. Extreme settings (lowest quality, highest tip, densest QR payload) are for known constraints — not first tries.
Inputs that surprise people
People often misread units or page indexes. Align with the on-screen labels and the total page count or unit selectors before blaming the engine.
Outputs and naming
Rename downloads immediately (date + client + purpose). Image Compressor may use a generic filename; clear names prevent sending yesterday’s draft.
Accessibility and sharing
After visual tools (watermark/sign/page numbers), skim a page with fresh eyes for contrast and coverage. After data tools, copy results into the system of record your team actually uses.
Privacy
Image Compressor is designed to run in your browser so your files and text are not uploaded for the core transformation.
Still handle downloads carefully: a private process can still leave sensitive files in your Downloads folder.
Optional accounts on TechDriven Tools, when used, are about lightweight usage metadata — not storing the contents of your Image Compressor inputs.
If policy requires a vendor DPIA for any online tool, note that local browser processing reduces data transfer risk, but downloaded artifacts still need handling under your retention rules.
Image Compressor is built to process locally in your browser so sensitive PDFs, images, or text do not need to be uploaded to an unknown server just to finish this job.
Common mistakes
- Crushing twice — Re-compressing an already soft social download stacks damage.
- Overwriting the only RAW/PNG — Keep masters; compress derivatives.
- Wrong format expectations — Some formats already tiny — gains may be small.
Getting reliable results from Image Compressor
Most failures with Image Compressor are input/setting issues rather than mysterious bugs: wrong units, wrong page lists, wrong language, or expecting one tool to do a sibling’s job. Re-read the option names, fix the input, and re-run — local tools make iteration cheap.
Image Compressor accelerates the workflow; it does not replace your judgment or professional advice where required.
Related tools
These related tools commonly sit before or after Image Compressor in real workflows.
- Image Resizer — Resize one or many images to exact dimensions — batch as ZIP.
- WebP Converter — Convert one or many JPG/PNGs to WebP — batch downloads as ZIP.
- PNG to JPG — Related browser-local tool on TechDriven Tools.
Use Image Compressor when you need this specific job done privately and quickly. Respect what it is not (see mistakes), verify outputs, and chain related tools only when the next step truly differs.
Start from Image Compressor.
If you arrived from search looking for Image Compressor, bookmark the tool page itself after this guide — the article exists to teach options and pitfalls, not to replace the working UI.
When something looks wrong in Image Compressor, reproduce with a tiny sample input first. Smaller fixtures debug faster than a 200-page scan or a 2MB JSON blob.
Share feedback with teammates as option recipes (“Quality 72%, bottom-center numbers, Start at 1”) rather than screenshots alone — recipes transfer cleanly.
From our blog: How to Compress an Image Without Losing Too Much Quality