To generate multiple QR codes at once, paste one text value or URL per line into a browser-based batch tool, choose a PNG pixel size and an error-correction level, and trigger a single generation pass that produces up to 20 separate PNG files with individual preview tiles and download links. The Bulk QR Code Generator follows that exact pattern: it accepts a list of unique lines, hands each line to the same qrcode 1.5.4 encoder used by Lizely's single-symbol tool, and returns one PNG data URL per entry without packaging the files into an archive or sending the payloads to a remote service. Because the entire job runs client-side, the same workflow works on a phone, a laptop, or a shared workstation without network setup, login, or background job tracking, and the input parser automatically drops empty lines, trims whitespace, and collapses exact duplicates so the batch reflects only the unique values you intended to encode.
What the Bulk QR Code Generator Actually Does
The tool is a thin batch layer over an existing QR encoder rather than a parallel implementation. Each line of input becomes one symbol, each symbol becomes one PNG, and each PNG receives a deterministic filename derived from the batch position and a short ASCII stem pulled from the content. A line such as https://example.com produces 01-example-com.png; a line that contains no ASCII letters or numbers falls back to the stem qr-code. The input parser performs three housekeeping steps before encoding: it trims surrounding whitespace, drops empty lines, and collapses exact trimmed duplicates down to the first occurrence. The first-seen rule means that pasting the same URL twice in different positions only ever renders one symbol, which keeps the batch focused on unique values.
After generation, every preview tile exposes its own download link rather than a single combined archive. That design choice is deliberate: the project intentionally avoids adding a new archive dependency, and it shifts the download decision to the person handling the batch. Browser policies can require a click per file or trigger a download permission prompt, but the generator never silently fires off 20 automatic downloads, which avoids surprising behaviour and makes the selected outputs explicit.
How to Generate Multiple QR Codes at Once
- Open the Bulk QR Code Generator in your current browser tab and locate the text area for line-separated input.
- Paste one text value or URL per line, keeping the total at 20 unique lines or fewer and each line at 2,000 JavaScript characters or fewer.
- Pick a PNG canvas size from the available options — 128, 256, or 512 pixels — and an error-correction level from L, M, Q, or H.
- Select the generate action and wait for every preview tile to render. If a single line exceeds the encoder's capacity for the chosen settings, the batch surfaces an error instead of presenting a partial set as complete.
- Scan each preview with the target device and application before downloading, because a generated image is not proof that every scanner will read the intended payload.
- Download each required PNG from its preview link using your browser's normal save flow, and keep a clear quiet zone around every image when you place it on a page, label, or printout.
Picking a PNG Size and an Error-Correction Level
Two settings affect every symbol in the batch: the PNG canvas size and the error-correction level. They influence different things, and confusing them is a common source of bulk-generation mistakes.
The canvas size only sets how large the rendered PNG file looks when displayed or printed. It does not add data capacity to the symbol. A 512-pixel canvas of a short URL has the same module count as a 128-pixel canvas of the same URL; the larger file simply distributes the same modules over more pixels, which helps when the code is printed at a large physical size or displayed on a high-density screen. For labels, business cards, and standard web placements, 256 pixels is usually enough; reserve 512 for posters, signage, or print runs that will be enlarged significantly.
Error correction controls how much of a symbol can be restored when part of it is damaged, obscured, or printed poorly. DENSO WAVE, the company that invented the QR Code, publishes the approximate restoration rates in its error-correction reference. The trade-off is that higher correction reduces the available data capacity and can force a denser module pattern, which in turn makes the symbol harder to scan at small physical sizes.
| Level | Approximate restoration rate | Practical use |
|---|---|---|
| L | About 7% of codewords | Clean digital display, short payloads, no overlay risk |
| M | About 15% of codewords | Default for most printed and displayed QR codes |
| Q | About 25% of codewords | Outdoor placement, light wear, branded overlays |
| H | About 30% of codewords | Industrial or harsh environments, long payloads |
Level M is the practical default for ordinary clean conditions. Reaching for level H "for safety" can backfire: a denser symbol at a small print size is harder to focus on and easier to misread than a level M symbol at the same physical size.
Verifying and Downloading Each QR Code
A successful render is not a guarantee that every scanner will read the code the same way. Long UTF-8 text, emojis, print resolution, ambient glare, camera focus, and the behaviour of the reader app all affect the outcome. The underlying library notes that full ECI support is not implemented, which means some readers may interpret unusual payloads differently. Treat every preview as a draft until the target device has decoded it character for character.
Downloading happens tile by tile. After scanning a preview and confirming the decoded payload, click that tile's download link to save the PNG with its deterministic filename. Changing an input line, the canvas size, or the error-correction level invalidates the previous batch: the asynchronous job identifier ensures that an older generation result cannot overwrite newer settings, so you never end up saving PNGs that came from a stale configuration.
Why Bulk Generation Stays in the Browser
Every payload and PNG data URL in the batch lives in the current tab. The qrcode 1.5.4 package used by the generator runs client-side, supports optimized encoding segments, and returns PNG data URLs without contacting a remote service. Nothing is uploaded, shortened, tracked, or recorded, which makes the same workflow usable for internal inventory codes, campaign URLs, contact cards, or Wi-Fi strings that you would rather not hand to a third-party platform.
That privacy model also removes a class of failure modes. There is no queue to wait in, no rate limit to trip, and no risk that a server-side encoder quietly rewrites a payload. The browser tab is the entire job, and closing the tab clears the batch.
Limits Worth Knowing Before You Paste
The batch boundary is 20 unique values, and each line is capped at 2,000 JavaScript characters. Those limits are not arbitrary: they bound CPU, memory, and layout work, and they keep accidental multi-download volume manageable on phones and ordinary laptops. If you need more than 20 symbols, run the tool twice with split lists rather than trying to push past the ceiling.
If a single payload exceeds the encoder's capacity for the chosen settings, the batch shows an error rather than a partial result. The most common cause is a long URL paired with level Q or H; dropping to level M or shortening the payload almost always resolves it. Empty lines and exact duplicates are removed automatically, so you do not need to clean the list before pasting.
When a Single-Symbol Tool Is Enough
For one-off QR codes — a single contact card, one Wi-Fi login, a personal link — the dedicated QR Code Generator walkthrough covers the simpler workflow without batch overhead. Reach for the bulk tool only when the task genuinely involves more than one or two symbols from a list you already have, because the batch workflow pays off when the input is a prepared text block rather than a series of one-off entries.