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Lizely

Bulk QR Code Generator

Generate up to 20 separate QR Code PNGs from unique lines locally using the project’s existing QR encoder.

Privacy: your files never leave your device. All processing happens locally in your browser.

How to use

  1. 1.Paste one text or URL per line, with no more than 20 unique lines.
  2. 2.Choose PNG size and error-correction level, then select Generate QR codes.
  3. 3.Scan each preview with the target device, download the verified PNGs individually, and preserve their quiet zones.

About Bulk QR Code Generator

Bulk QR Code Generator creates a small batch of QR Code PNG images entirely in the browser. Paste one text or URL per line, choose a pixel size and error-correction level, and generate up to 20 unique symbols in one operation. Each preview has its own deterministic filename and download link, so no archive library or server job is required.

The input parser trims surrounding whitespace, removes empty lines, and deduplicates exact repeated lines while preserving first-seen order. The batch limit is 20 unique values and each line is limited to 2,000 JavaScript characters. These product limits bound CPU, memory, layout work, and accidental multi-download volume on phones and ordinary laptops.

QR encoding is delegated to the qrcode 1.5.4 package already used by Lizely’s single QR Code Generator. The library runs client-side, supports optimized encoding segments, and returns PNG data URLs. This batch tool does not maintain a second QR implementation or copy capacity tables into product code, reducing the risk that two encoders drift apart.

Choose 128, 256, or 512 pixels for the PNG canvas. More pixels can improve appearance when a symbol is displayed or printed larger, but pixel dimensions do not increase the data capacity of the QR symbol. Keep a clear quiet zone around the image and avoid stretching, recoloring, cropping, or covering finder patterns after download.

Error-correction levels L, M, Q, and H offer increasing restoration capability while reducing available data capacity. DENSO WAVE describes approximate codeword restoration rates of 7%, 15%, 25%, and 30%. A higher setting is not automatically better: it can force a denser symbol. Level M is the practical default for ordinary clean display conditions.

Generated filenames start with a two-digit batch position and a short ASCII stem derived from the content. A URL such as https://example.com becomes 01-example-com.png. If a line contains no ASCII letters or numbers, the fallback stem is qr-code. Filenames are convenience labels only and never alter the encoded payload.

The page does not combine files into ZIP because the project intentionally adds no new npm dependency for this batch. Download each required PNG from its preview. Browser policies may require a click per file or may prompt for download permission. The generator does not trigger 20 automatic downloads, which avoids surprising behavior and makes the selected outputs explicit.

A generated image is not proof that every scanner will read the intended content. Long UTF-8 text, emojis, print size, contrast, camera focus, display glare, physical damage, and reader behavior all affect success. Some QR readers may interpret URLs, contact text, or other payloads differently, and the library notes that full ECI support is not implemented.

Always scan every final PNG with the target device and application before publishing, printing, labeling inventory, distributing event material, or replacing an existing code. Check the decoded payload character for character. Do not use an unchecked QR Code for payments, authentication secrets, safety instructions, or irreversible actions.

All payloads and PNG data URLs remain in the current tab. Nothing is uploaded, shortened, tracked, or recorded. Changing an input or option invalidates the previous batch, and an asynchronous job identifier prevents an older generation result from overwriting newer settings. If one payload exceeds QR capacity, the batch shows an error instead of presenting a partial set as complete.

Methodology & sources

Trim line-separated input, remove blanks, deduplicate exact values in first-seen order, enforce 20 unique lines and 2,000 characters per line, derive deterministic indexed filenames, and call the existing qrcode 1.5.4 browser toDataURL API with selected width, margin 2, and L/M/Q/H error correction. Generate the batch concurrently under a job identifier, discard stale results, expose individual PNG downloads, and require target-device scan verification.

Frequently asked questions

Why is there no Download ZIP button?
This batch deliberately adds no archive dependency; each locally generated PNG has its own explicit download link.
Are duplicate lines generated twice?
No. Exact trimmed duplicates collapse to the first occurrence.
Does higher error correction always scan better?
No. It improves restoration capability but reduces capacity and can make a symbol denser.
Are my URLs uploaded or tracked?
No. QR encoding and PNG rendering happen entirely in the current browser tab.

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