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Herramientas PDF, de imagen, para desarrolladores, SEO, de texto, para estudiantes y empresas — todas gratis, todas enteramente en tu navegador. Sin subidas, sin cuenta, ningún servidor ve tus datos.
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
Should I use MD5 for security purposes?
No — MD5 is cryptographically broken and is offered here only for legacy checksum compatibility (matching a checksum an old system or vendor already published). It's implemented separately in JavaScript rather than through the browser's Web Crypto API, which deliberately doesn't include MD5 at all. Use SHA-256 or higher for anything security-related.
Which algorithm should I use?
SHA-256 is the standard default for most purposes; SHA-384/512 offer a larger digest where that's specifically required.
Is the same input always the same hash?
Yes — hashing is deterministic; identical input text with the same algorithm always produces the identical hash output.
Can I hash a file, or only text?
Only typed or pasted text — there's no file upload option for this tool.
Does capitalization or spacing change the hash?
Yes — hashing is exact; even a single different character, including case or whitespace, produces a completely different hash.
Can I reverse a hash back to the original text?
No — hashing is one-way by design; there's no way to recover the original input from its hash alone.
Why would I use SHA-384 or SHA-512 instead of SHA-256?
They produce a longer digest, which some specific protocols or compliance requirements call for; SHA-256 is sufficient and standard for most general-purpose uses.
Is my text sent anywhere to compute the hash?
No — hashing uses the browser's built-in Web Crypto API (crypto.subtle.digest), entirely client-side.
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.
Hash Generator, in depth
Hash Generator computes SHA-256 and other digests in-browser for checksums and fingerprinting without uploading secrets.
How Hash Generator works here
On TechDriven Tools, Hash Generator runs in your browser.g. SHA-256), input text/file fingerprint. Processing stays on your device.
Read every label before running. For Hash Generator, the controls that change outcomes most are: algorithm choice (e.g. SHA-256), input text/file fingerprint. Change one control at a time when you are comparing results.
When to use it
Use Hash Generator 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: algorithm choice (e.g. SHA-256), input text/file fingerprint.
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 Hash Generator 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 Hash Generator 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.
Verify a download. Compare SHA-256 to the publisher’s published digest.
Fingerprint configs. Hash a canonical string to detect drift.
Teach hashing safely. Demonstrate digests without sending sample secrets to a website.
Options that change the result
Primary controls
The important controls are: algorithm choice (e.g. SHA-256), input text/file fingerprint. Change one at a time when comparing outcomes so you know what improved the result.
Run and verify
After you run Hash Generator, 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 Hash Generator, 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). Hash Generator 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
Hash Generator 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 Hash Generator 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.
Hash Generator 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
- Comparing mismatched algorithms — SHA-1 vs SHA-256 digests will never match.
- Hashing the wrong canonical form — Whitespace differences change digests.
- Thinking hashing hides data for transport secrecy — Hashes are fingerprints, not encryption.
Getting reliable results from Hash Generator
Most failures with Hash Generator 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.
Hash Generator accelerates the workflow; it does not replace your judgment or professional advice where required.
Related tools
These related tools commonly sit before or after Hash Generator in real workflows.
- Base64 Encoder/Decoder — Encode text to Base64, or decode Base64 back to plain text.
- Password Generator — Generate strong, random passwords with a custom length and character set.
- JWT Decoder — Decode a JWT's header and payload to inspect its claims.
Use Hash Generator 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 Hash Generator.
If you arrived from search looking for Hash Generator, 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 Hash Generator, 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.
For Hash Generator, bookmark /hash-generator after you learn the option names in this guide — the article teaches; the tool page is for daily use.
From our blog: How to Generate SHA-256 and Other Hashes Online