Number Base Converter Online — Free & Private
Convert numbers between binary, octal, decimal and hexadecimal. Free, private, and processed entirely in your browser — no upload, no account, no file ever leaves your device.
How to use Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal. Everything runs in this tab — nothing is uploaded for the core job.
- Enter your content — Type or paste what you want to work with — Number Base Converter runs immediately in your browser.
- Choose your options — Set any options Number Base Converter offers.
- Get your result — Copy or download the result \u{2014} done entirely on your device, nothing uploaded.
Privacy proof for Number Base Converter
This tool processes files in your browser. Open DevTools → Network while you run it: your document is not uploaded. After one online visit, many tools keep working with Airplane Mode on (libraries cached locally).
Popular tools
The highest-demand tools with full options — browse by category below for the rest.
Star any tool — it appears under Favorites on this device.
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 uses a small on-demand converter when the browser cannot decode HEIC natively (Safari often works without it); 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
Which number bases are supported?
Binary (base 2), octal (base 8), decimal (base 10), and hexadecimal (base 16) — the four most commonly used in programming and computing.
Do all four values update at once?
Yes — enter a number in any one base and the other three update instantly, all shown together rather than one conversion at a time.
Does it validate my input for the chosen base?
Yes — e.g. entering "9" while typing in binary is rejected, since 9 isn't a valid binary digit; you'll see a clear error instead of a silently wrong result.
Does it support negative numbers?
No — this handles non-negative integers only, the common case for base conversion. Negative-number and fractional-value conversion aren't supported.
Is there a size limit on the number?
Practically limited by JavaScript's safe integer range — very large numbers (beyond about 9 quadrillion in decimal) may lose precision.
Why would I need hexadecimal to binary specifically?
Common in low-level programming and debugging — reading memory addresses, color codes, or bitmask values often means converting between hex and binary by hand otherwise.
Does this work offline?
Yes — base conversion is pure arithmetic done entirely in your browser; no network request is made.
Is my input sent anywhere?
No — nothing is transmitted; the conversion happens locally as you type.
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.
Number Base Converter, in depth
Convert numbers between binary, octal, decimal, and hexadecimal — instantly, as you type.
Features
Binary
Base 2 — the format computers work in natively.
Octal
Base 8, still used in some Unix file permission notations.
Decimal
Base 10 — everyday counting numbers.
Hexadecimal
Base 16 — common in color codes, memory addresses, and hashes.
Why use Number Base Converter
- Convert a hex color code to decimal RGB values (or the reverse) while debugging.
- Understand binary representation while learning or teaching computer science basics.
- Check a memory address or bitmask given in hexadecimal.
- Convert a Unix permission value between octal and its meaning.
How it works
Enter a number in any one base, and it converts to the other three simultaneously — pure arithmetic done entirely in your browser using JavaScript's own base-conversion support, with no external service or lookup involved.
Does this work offline?
Yes — base conversion is pure arithmetic; no network request is made for any conversion.
Why people search for Number Base Converter
Convert numbers between binary, octal, decimal and hexadecimal. For teams, share the link instead of emailing binaries of desktop installers — everyone gets the same Number Base Converter behavior in a modern browser.
Number Base Converter sits in our Converters group. The page is built so you can finish the job without creating an account, installing a desktop pack, or sending the payload to an unknown converter API.
Who Number Base Converter is for
- You want a second opinion after another converter produced a weird output.
- You need a result now and do not want another account wall.
- The file or text is sensitive enough that uploading feels wrong.
- A desktop suite is overkill for a one-page or one-photo job.
Recommended workflow
Confirm from/to units → enter the value once → copy the result into the system of record.
- Open Number Base Converter (also available from category hubs and ⌘K).
- Use the labeled fields or dropzone — options match what Number Base Converter actually does.
- Run the tool and wait for local progress to finish.
- Download or copy the result, then verify on the device where you will share it.
Tips that improve results
- Keep the original until stakeholders accept the download.
- Rename the output with date + purpose before you attach it to email.
- On phones, plug in power for large PDFs, videos, or spreadsheets.
- Prefer UTF-8 text for developer converters; weird encodings cause most “broken” results.
- Start with a non-sensitive sample so you learn the options before the real file.
- Change one setting at a time when you are comparing quality or layout.
Common mistakes with Number Base Converter
- Expecting Number Base Converter to replace a full desktop suite for every edge-case format.
- Skipping a sample check and discovering a bad export after the original was deleted.
- Chaining many lossy image/PDF steps when one careful pass would have been enough.
- Using a public computer without clearing downloads afterward.
Privacy model
Processing for Number Base Converter is designed to stay in the browser. Laravel serves the page; it does not receive your file bytes for conversion. Optional Supabase auth only stores which tool you ran and when — never filenames or contents.
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FAQ — Number Base Converter
Is Number Base Converter free to use?
Yes. Number Base Converter on TechDriven Tools is free — no account, no watermark, and no paywall for the core workflow.
Does Number Base Converter upload my file or text?
No for processing. Number Base Converter runs in your browser tab. Optional sign-in never stores file contents — only tool names and timestamps if you enable history.
When should I use Number Base Converter?
Use Number Base Converter for Converters jobs where privacy and speed matter: quick one-offs, sensitive inputs, or checking another app’s result without another upload site.
Will Number Base Converter work on my phone?
Yes in a modern mobile browser. Large inputs can take longer because your device does the work locally.
What are the limits of Number Base Converter?
There is no server quota from us. Limits are your device memory, battery, and formats the browser can decode. Number Base Converter will not pretend to support server-only Office or cloud-AI pipelines.
How is Number Base Converter different from upload-based sites?
Upload converters send your content to someone else’s server. Number Base Converter keeps the transform on-device whenever the format allows, which is the safer default for confidential documents, photos, tokens, and configs.
Bottom line
If you need Number Base Converter done quickly and privately, start at /number-base-converter, run it once on a sample, then process the real input. That is how TechDriven Tools stays competitive: honest capabilities, labeled UI, and content that matches what the tool actually ships.
From our blog: How to Convert Between Binary, Octal, Decimal, and Hex