Bulk QR Code Generator is a browser-based API alternative for turning up to 20 unique text or URL lines into separate QR Code PNG files, with encoding and PNG rendering kept in the current tab. Instead of sending values to a server-side generation job, paste a final list, choose a canvas and error-correction level, and generate previews in the browser. This makes it a practical solution for small batches that need individual review and individual downloads. The tool accepts no more than 20 unique values, limits each line to 2,000 JavaScript characters, trims surrounding whitespace, removes empty lines, and collapses exact duplicates. Each accepted value receives an indexed, deterministic filename and its own download link. There is no ZIP archive and no automatic burst of 20 downloads. You select the verified files you need. All payload text and generated PNG data URLs remain in the current browser tab; they are not uploaded, shortened, tracked, or recorded. If a payload exceeds QR capacity, the generator reports an error instead of presenting a partial batch as complete.
A local API alternative for up to 20 symbols
The key distinction is the kind of work being performed. Bulk QR Code Generator handles a finite, user-reviewed list through an interactive browser workflow. An API-oriented solution is designed for code to send generation requests and receive results programmatically. The local approach is useful when the inputs already exist in a text list, spreadsheet column, campaign document, or content worksheet and can be pasted as one value per line.
| Requirement | Best fit | Why |
|---|---|---|
| Create up to 20 unique codes | Local batch workflow | Generate and review separate PNG previews from one accepted list. |
| Keep payloads in the current tab | Local batch workflow | Encoding and PNG rendering occur in the browser. |
| Verify the actual decoded value | Local batch workflow | Each preview can be scanned with the target device and application. |
| Send generation requests from application code | API-oriented workflow | A local page interaction is not a substitute for application integration. |
| Process recurring batches larger than 20 values | API-oriented workflow | The documented local batch limit would need to be split into multiple operations. |
For a small, defined list, avoiding a server round trip makes review more direct. You control the final values before generation, see every result, scan the destinations, and download only the files that passed verification. The tradeoff is that this is a browser-based batch task rather than an automated request loop built into another system.
Prepare a final one-item-per-line list
Start with one text or URL on each line. Do not place multiple values on a single line or depend on commas to separate them, because the generator treats each newline as a separate input value. Once submitted, the parser trims surrounding whitespace, removes empty lines, and deduplicates exact repeated lines while preserving the order of their first appearance.
The total batch must contain no more than 20 unique values. Because duplicates count only once after parsing, three identical lines become one output rather than three. A line can contain no more than 2,000 JavaScript characters. This is a character limit, not a guarantee that every value within the limit can be encoded.
QR capacity also depends on the content and selected error-correction level. A long value can fit within the 2,000-character input limit and still exceed the capacity of the QR symbol. When that happens, the tool shows an error rather than returning a partial set marked as complete. Long UTF-8 text and emoji can also affect encoding or scanner behavior, and the underlying qrcode library notes that full ECI support is not implemented. Test any non-ASCII or unusually long payload with the target reader.
If the URLs come from a repeated template rather than an existing hand-maintained list, the Bulk URL Generator for browser-side lists can create the source list first. Review the resulting values, then paste the final URLs into the QR batch. Keeping preparation and generation as separate reviewed steps makes filename mapping and scan verification easier.
Choose PNG size for the final placement
The generator offers 128, 256, or 512 pixel PNG canvases. The canvas choice controls image dimensions, not the amount of data the QR symbol can contain. More pixels can improve appearance when a symbol is displayed or printed larger, but a 512 pixel image does not carry more encoded information than a smaller version of the same payload.
| PNG canvas | Position among available choices | Selection guidance |
|---|---|---|
| 128 pixels | Smallest | Use the smallest listed canvas when that dimension is suitable for the final placement. |
| 256 pixels | Middle | Use the middle option when a larger canvas is needed without choosing the maximum. |
| 512 pixels | Largest | Use the maximum canvas when the symbol will be displayed or printed at a larger size. |
Evaluate the chosen canvas at the actual display or print size. A larger image does not overcome a pixelated display, poor contrast, glare, physical damage, or an incorrect error-correction choice. Keep a clear quiet zone around the symbol after downloading it, and do not stretch, recolor, crop, or cover the finder patterns.
Match error correction to the environment
Error correction comes in four levels: L, M, Q, and H. Higher levels provide more restoration capability but reduce the data available to the symbol and can produce a denser QR code. DENSO WAVE describes approximate restoration rates of 7%, 15%, 25%, and 30% for L, M, Q, and H respectively.
| Level | Approximate restoration rate | Tradeoff |
|---|---|---|
| L | 7% | Lowest restoration level and the most available data capacity among the four choices. |
| M | 15% | Practical default for ordinary clean display conditions. |
| Q | 25% | More restoration capability with less data capacity than M. |
| H | 30% | Highest restoration level, with the least available data capacity of the four. |
Higher correction is not automatically better. Choosing H can force a denser symbol that is harder for a target device to scan, especially when the input is already near capacity. Begin with M for a clean display, then adjust only when the placement or payload requires a tested tradeoff.
Use the encoder already in the project
Bulk QR Code Generator delegates encoding to the qrcode 1.5.4 package already used by Lizely’s single QR Code Generator. The batch workflow runs client-side, uses the selected width and correction level with margin 2, and returns PNG data URLs through the library’s browser API. It does not maintain a second QR implementation or duplicate capacity tables. The node-qrcode browser API documentation describes the underlying client-side approach.
Generate, scan, and download the PNGs
Use the Bulk QR Code Generator for this local batch workflow:
- Paste the final values. Put one text or URL per line, with no more than 20 unique lines and no more than 2,000 JavaScript characters in any line. Remove blank lines manually if they are not meaningful, and decide whether repeated values should remain before generation.
- Choose the PNG size and error-correction level. Select 128, 256, or 512 pixels for the canvas. Start with correction level M for an ordinary clean display, or choose another level after accounting for the payload, available capacity, and final placement.
- Select Generate QR codes. The accepted values are encoded in the browser. If one payload exceeds QR capacity, correct the input and generate the batch again rather than treating a partial result as complete.
- Scan every preview with the target device and application. Check the decoded payload character for character. A generated image is not proof that every scanner will read the intended value, so account for camera focus, display glare, physical damage, long UTF-8 text, emoji, and reader-specific behavior.
- Download the verified PNGs individually. Click the download link attached to each required preview. Browser policies may require a separate click or a download permission prompt, but the tool does not launch 20 automatic downloads. Preserve each quiet zone and keep the finder patterns clear.
Do not publish, print, label inventory, distribute event material, or replace an existing code from the preview alone. The same caution is especially important for payments, authentication secrets, safety instructions, or any action that is difficult or impossible to reverse.
Review filenames, privacy, and stale results
Every preview has a deterministic filename beginning with a two-digit batch position and a short ASCII stem derived from its content. For example, https://example.com becomes 01-example-com.png. If a line has no ASCII letters or numbers, the filename uses the fallback stem qr-code. These names are convenience labels only; they never change the encoded payload.
Payloads and PNG data URLs remain in the current tab. Nothing is uploaded, shortened, tracked, or recorded. Closing or replacing the batch with a new input clears the earlier results from the active workflow. Changing an input or option also invalidates the previous batch, and an asynchronous job identifier prevents an older generation result from overwriting newer settings.
The first-seen order is important because it controls both the batch position in each filename and the order in which the previews are presented. If a payload is too large for the selected QR settings, the tool reports an error instead of silently dropping it. Treat that message as a signal to shorten the value, choose a different error-correction level, or use a different encoding solution.
Use an API when the job grows past a small local batch
The practical decision is straightforward: use Bulk QR Code Generator when the job contains up to 20 unique values, the browser workflow is acceptable, and individual review is valuable. Use an API-oriented approach when application code must request generation, the operation must run continuously, or each job must handle more than 20 values. The local tool is an alternative for a small batch, not an unlimited substitute for a programmatic integration.
Prepare and verify the complete list before opening the generator. Once the previews pass the target-device scan check, download the required files individually and retain the source list beside them. The combination of local processing, explicit batch limits, deterministic labels, separate PNG downloads, and target-device verification gives each output a clear review path without introducing a server request or archive dependency.