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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's the difference between Add GST and Remove GST?
"Add GST" treats your amount as the base price and calculates GST on top of it. "Remove GST" treats your amount as already including GST and works backward to find the base price — use this when you have a final price and need to know how much of it is tax.
Which GST rates are available?
The common Indian GST slabs — 5%, 12%, 18%, and 28% — plus a Custom option for any other rate.
Is the math the same as official GST calculations?
Yes — standard percentage-based GST math (amount × rate/100 to add; amount ÷ (1+rate/100) to work backward from a GST-inclusive total).
Can I use this for a different country's VAT/sales tax?
Yes, mechanically — the math is generic percentage tax math; just enter that region's rate in the Custom field. The preset rates and "GST" framing are specifically Indian, though.
Is this official tax advice?
No — it's a convenience calculator for quick estimates, not professional tax or accounting advice. Confirm anything that matters for filing or compliance with a qualified professional.
Does it round the result?
Results are shown to 2 decimal places, standard for currency amounts.
Can I copy the result?
Yes — a Copy to clipboard button sits next to the calculated breakdown.
Is my amount sent anywhere?
No — the calculation happens entirely in your browser as you type; nothing 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.
GST Calculator, in depth
GST Calculator switches inclusive/exclusive modes so you can derive net, tax, and gross from Indian GST-style rates.
Disclaimer: Educational estimate only — not financial, tax, investment, or medical advice. Verify with a professional or official source before acting.
How GST Calculator works here
GST Calculator 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 GST Calculator, the controls that change outcomes most are: rate %, inclusive vs exclusive mode, amount field. Change one control at a time when you are comparing results.
When to use it
Use GST Calculator 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: rate %, inclusive vs exclusive mode, amount field.
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 GST Calculator 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 GST Calculator 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.
Price a quote tax-inclusive. Derive base and tax from a gross amount.
Build tax-exclusive invoices. Add GST on net line totals.
Cross-check accounting exports. Sanity-check a spreadsheet cell before sending a client PDF.
Options that change the result
Primary controls
The important controls are: rate %, inclusive vs exclusive mode, amount field. Change one at a time when comparing outcomes so you know what improved the result.
Run and verify
After you run GST Calculator, 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 GST Calculator, 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). GST Calculator 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
GST Calculator 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 GST Calculator 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.
GST Calculator 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
- Wrong inclusive/exclusive mode — The same input means different nets — read the mode label.
- Using outdated rates — Confirm the rate % for your category.
- Confusing CGST/SGST split displays — Know whether you need a combined rate or components.
Getting reliable results from GST Calculator
Most failures with GST Calculator 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.
GST Calculator accelerates the workflow; it does not replace your judgment or professional advice where required.
Related tools
These related tools commonly sit before or after GST Calculator in real workflows.
- Invoice Generator — Fill in a simple form and generate a clean, downloadable PDF invoice.
- Tip Calculator — Calculate tip amount and per-person share from bill total, tip percent, and split count.
- Currency Converter — Convert between common currencies using a small indicative rate table versus USD.
Use GST Calculator 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 GST Calculator.
If you arrived from search looking for GST Calculator, 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 GST Calculator, reproduce with a tiny sample input first. Smaller fixtures debug faster than a 200-page scan or a 2MB JSON blob.
From our blog: How to Calculate GST (Inclusive and Exclusive)
Free to use — the embedded widget links back to this page, and runs entirely in the visitor's browser, same as the full tool.