Barcode Generator Online — Free & Private
Generate a downloadable barcode in CODE128, EAN-13, UPC, or other common formats. Free, private, and processed entirely in your browser — no upload, no account, no file ever leaves your device.
How to use Barcode Generator
Generate a downloadable barcode in CODE128, EAN-13, UPC, or other common formats. Everything runs in this tab — nothing is uploaded for the core job.
- Enter your content — Type or paste what you want to work with — Barcode Generator runs immediately in your browser.
- Choose your options — Set any options Barcode Generator offers.
- Get your result — Copy or download the result \u{2014} done entirely on your device, nothing uploaded.
Privacy proof for Barcode Generator
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 barcode formats are supported?
CODE128, EAN-13, UPC, CODE39, ITF, MSI, Pharmacode, and Codabar — the common 1D formats most scanners and retail systems expect.
Which format should I use?
EAN-13/UPC for retail products (if you have an assigned product number), CODE128 for general-purpose alphanumeric data, CODE39 for simpler legacy systems (inventory, asset tags).
Does it validate the input for each format?
Yes — e.g. EAN-13 requires exactly 12-13 digits; entering the wrong length or a non-numeric character for a numeric-only format shows a clear error instead of generating an invalid barcode.
Will it scan correctly with a real barcode scanner?
Yes — it's rendered to the exact bar widths each format's specification defines, the same output a scanner expects, not just a barcode-looking image.
What file format does it download as?
A PNG image, generated from an on-page canvas.
What size should I use for printing?
Higher resolution prints more reliably scannable — if the downloaded PNG looks too small for your label, increase the width/height before downloading rather than stretching the image afterward, which blurs the bars.
Can I use this for real retail products?
You can generate a technically valid EAN-13/UPC barcode from a number you already own, but actually selling under a UPC requires that number to be properly registered with GS1 — this tool doesn't assign or register numbers, just renders one you provide.
Is my data sent anywhere?
No — the barcode is rendered entirely in your browser; 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.
Barcode Generator, in depth
Generate a downloadable barcode in CODE128, EAN-13, UPC, or other common formats — scannable by real hardware.
Features
8 Barcode Formats
CODE128, EAN-13, UPC, CODE39, ITF, MSI, Pharmacode, Codabar.
Real Spec Compliance
Bar widths follow each format's actual specification, not an approximation.
Input Validation
Catches invalid data for a format before generating a broken barcode.
PNG Download
A print-ready image, generated locally.
Why use Barcode Generator
- Create a product barcode for retail or inventory use.
- Generate an asset tag barcode for internal tracking.
- Test a barcode scanner with a known, valid code.
- Prepare a label for a shipment, event ticket, or ID badge.
How it works
This uses JsBarcode, a real, widely-used open-source library that renders each format according to its actual published specification — the bar widths and check digits are computed correctly, so the output scans reliably with real hardware, not just visually resembling a barcode.
Picking the right format
EAN-13 and UPC are for retail products with an assigned product number (note: this tool renders a barcode from a number you provide, it doesn't register or assign one with GS1). CODE128 handles general alphanumeric data flexibly. CODE39 remains common in older inventory and asset-tracking systems. Pick the format your scanning system or use case actually expects.
Why people search for Barcode Generator
Generate a downloadable barcode in CODE128, EAN-13, UPC, or other common formats. Bookmark /barcode-generator if Barcode Generator is part of your weekly workflow; the URL is stable and the tool stays free.
Barcode Generator sits in our Developer Tools 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 Barcode Generator is for
- A desktop suite is overkill for a one-page or one-photo job.
- 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.
Recommended workflow
Paste only what you intend to transform → run locally → copy into your editor or terminal → never paste production secrets into random upload sites.
- Open Barcode Generator (also available from category hubs and ⌘K).
- Use the labeled fields or dropzone — options match what Barcode Generator 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
- 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.
- Keep the original until stakeholders accept the download.
- Rename the output with date + purpose before you attach it to email.
Common mistakes with Barcode Generator
- Expecting Barcode Generator 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 Barcode Generator 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.
Related tools
- Password Generator
- Base64 Encoder/Decoder
- Hash Generator
- JSON Formatter
- JWT Decoder
- QR Code Generator
FAQ — Barcode Generator
Is Barcode Generator free to use?
Yes. Barcode Generator on TechDriven Tools is free — no account, no watermark, and no paywall for the core workflow.
Does Barcode Generator upload my file or text?
No for processing. Barcode Generator 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 Barcode Generator?
Use Barcode Generator for Developer Tools jobs where privacy and speed matter: quick one-offs, sensitive inputs, or checking another app’s result without another upload site.
Will Barcode Generator 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 Barcode Generator?
There is no server quota from us. Limits are your device memory, battery, and formats the browser can decode. Barcode Generator will not pretend to support server-only Office or cloud-AI pipelines.
How is Barcode Generator different from upload-based sites?
Upload converters send your content to someone else’s server. Barcode Generator 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 Barcode Generator done quickly and privately, start at /barcode-generator, 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 Generate a Barcode Online