Bemiv Bulk Converter

Powerful Batch Image Optimization Lab

Image Converter

JPG, PNG, WebP, GIF, BMP, TIFF, HEIC and PDF — converted server-side.

Open the tool →

Image Resizer

Width / height precise resizing with stretch, crop and fit modes.

Open the tool →

Image Cropper

Frame, rotate and reset photos directly inside your browser.

Open the tool →

Bemiv Image Converter

Convert between JPG, PNG, WebP, GIF, BMP, TIFF, HEIC and PDF with high-volume results.

Convert To

Image Quality

Quality only affects JPEG and WebP outputs. Higher numbers retain more detail at the cost of file size.

90

Bemiv as a queue worker

Bemiv inherits the architecture of a bulk pipeline that processes hundreds of thousands of marketplace images a week from a Zürich engineering office. The web converter you see is the same code path with smaller inputs: durable queues behind it, exponential-backoff retries, idempotent outputs, deterministic filenames. A user dropping twelve files onto the public UI is benefitting from infrastructure built for ten thousand.

Bad files fail individually rather than aborting the whole batch. Conversion settings travel via the download URL so the same conversion repeated tomorrow produces a recognisably similar URL. We sign DPAs and ISDAs for Swiss enterprise customers; the public tier carries the same retention guarantees with no additional contract.

Step-by-step batch flow

  1. Drop the file or batch into the upload zone. Bemiv accepts up to the per-tier limit; bad files fail individually rather than aborting the batch.
  2. Pick the destination format from the menu. The advanced panel exposes encoder-specific quantisation parameters for procurement audits.
  3. Set quality. The default of 80 is what we use on bulk marketplace pipelines; 90 for hero assets; 95 only for archival exports.
  4. Press Convert. Each file enters an isolated worker process; failures are reported per file with structured diagnostics.
  5. Download per-file or grab the deterministic ZIP. The download URL contains a SHA-256 prefix so the same conversion repeated tomorrow is recognisable.

Technical handbook from the Bemiv team

The following sections extend the quick steps above with the engineering detail we would give to a colleague. Bemiv Bulk Converter is built around high-volume bulk image optimisation done deterministically; every recommendation below is written against real workloads, not generic marketing copy. If anything conflicts with your in-house policy, your policy wins — but if you are starting from scratch, this is the baseline we ship in production.

Format selection matrix

JPG is the default interchange format for continuous-tone photography on the web and in most CMS pipelines. It does not support transparency; semi-transparent PNGs flattened to JPG acquire a flat colour background (usually white). PNG is lossless and should be chosen when you have hard edges, UI screenshots, diagrams or alpha channels. WebP offers both lossy and lossless modes and typically beats JPG on byte size at the same perceived quality; Bemiv prefers WebP for outbound web assets when the destination stack supports it. GIF should be reserved for legacy animation or extremely constrained environments — for static graphics, PNG or WebP lossless is almost always superior. BMP and TIFF are archival and print-interchange formats; they produce large files and are inappropriate for browser delivery but excellent for hand-off to a pre-press partner. HEIC is the default capture format on many modern phones; converting HEIC to JPG or WebP is the standard path before uploading to web platforms that do not yet parse HEIC reliably. PDF is a container: raster pages embedded in PDF through Bemiv are suitable for proofing and lightweight document assembly, not for replacing a professional pre-press workflow.

Colour profiles and metadata

Our Imagick-based pipeline reads embedded ICC profiles where present and aims to produce outputs that decode predictably in sRGB-centric browsers. Wide-gamut sources (Adobe RGB or ProPhoto) may be perceptually compressed when targeting sRGB — that is expected behaviour, not a bug. EXIF orientation tags are honoured on read. IPTC copyright and caption fields are preserved on formats that support embedded metadata in our build configuration; if you rely on a specific metadata block for legal reasons, spot-check the output in exiftool after first use.

Quality slider semantics

The quality control affects only lossy codecs (JPG, WebP lossy). It maps to encoder-specific quantisation tables — not to a literal “percentage of pixels kept”. A setting of 80 is the Bemiv recommended default for web photography; 90 for hero images and portraits where banding is more costly than bytes; 95+ should be rare and usually indicates that the asset should have stayed in PNG or TIFF until final delivery. Lossless targets ignore the slider by design.

Security and retention

Uploaded files are written only to a quarantined temporary directory with regenerated names. Path traversal attempts are rejected at validation. MIME sniffing via finfo is combined with extension checks. Working files and derivatives are deleted automatically within twenty-four hours. We do not train models on your content, sell thumbnails, or fingerprint files for advertising. If your organisation requires a Data Processing Agreement, contact contact@bemiv.com with your jurisdiction and volume.

When Bemiv conversion is the wrong tool

Do not use the browser converter for medically regulated imaging, forensic evidence chains, or mission-critical print colour proofing without independent validation. Do not batch confidential material from an unmanaged device on a shared network without VPN discipline. For anything requiring CMYK separations, spot channels, or ink-limit profiles, stay in desktop pre-press software until the final rasterisation step.

Bulk JPG-to-format presets

JPG TO PNG JPG TO GIF JPG TO WEBP JPG TO BMP JPG TO PDF JPG TO PSD JPG TO AI JPG TO TIFF JPG TO HEIC

Why Bemiv ships to high-volume customers

Queue-worker semantics

Each conversion runs in an isolated worker process; one bad file cannot starve another user’s job.

Deterministic filenames

Output filenames carry a SHA-256 prefix derived from the source bytes and the conversion settings.

Idempotent reruns

Same source, same settings, same byte stream out. Useful for marketplace audit reconciliation.

Per-file diagnostics

Failures surface with structured error codes rather than as a generic “something went wrong” modal.

Bulk-processing journal

Operations questions for Zürich

Which image formats can Bemiv convert between?

Our converter accepts JPG, JPEG, PNG, GIF, WebP, BMP, TIFF and HEIC sources, and exports to JPG, PNG, GIF, WebP, BMP, PDF, PSD, AI, TIFF and HEIC. PSD, AI and HEIC outputs require Imagick to be compiled with the matching delegates on the server, so check the about page if a particular format does not appear in your dropdown.

Is there a file size or batch limit?

Each upload is capped at the size displayed on the upload area, which by default is 5 MB per file with up to five files per batch. The limit is configurable per domain. If your file is larger, please resize it first or contact us at contact@bemiv.com for guidance.

Are converted images stored on the server?

Originals and converted output files are written to a temporary directory and automatically deleted after twenty-four hours by a sweeper that runs on every request. We do not keep copies, hashes or thumbnails of your files for analytics, advertising or any other purpose.

Why does WebP look smaller than JPG at the same quality?

WebP uses a more modern compression algorithm than JPG, so it usually delivers similar perceived quality at twenty to thirty percent smaller file size. That is why Bemiv uses WebP as its preferred output for web-facing assets, especially when bulk processing, batch consistency and pipeline optimisation matters.

Can I convert PDF files into images?

The current public version of the Bemiv converter focuses on raster-to-raster and raster-to-vector container conversions (for example JPG to PDF). PDF-to-image splitting is not exposed in the user interface yet, but the underlying Imagick stack supports it. Drop us a note if this is something your team needs.

Does the quality slider affect lossless formats?

No. PNG, GIF and BMP are lossless containers, so the quality slider has no effect on them. The slider only changes the JPEG and WebP encoders, which use real lossy compression.

Can I convert images on a mobile device?

Yes. The interface is fully responsive and works in any modern mobile browser. HEIC photos taken with iPhones can be uploaded straight to Bemiv and converted to JPG or WebP for sharing.

Does $short add a watermark to converted images?

No watermark, ever. The output you download is exactly what the converter produced, with no logos, attribution overlays or banner stripes added.

How is the file integrity protected?

All traffic between your browser and Bemiv is encrypted with HTTPS. The server-side handler validates MIME type and extension, regenerates the file name to prevent path collisions, and limits acceptable formats to a curated whitelist.

Does Bemiv support CMYK or print-ready PDF workflows?

The public Bemiv Bulk Converter converter targets sRGB-centric web and office workflows. CMYK separation, ink limiting and certified print PDFs require desktop pre-press software. You can still use Bemiv for intermediate raster normalisation before handing off to a print partner.

Can teams standardise on Bemiv presets?

Yes. Many Bemiv users document three internal presets (web hero, thumbnail, archive) and share the quality and format numbers in their design-system wiki. The tool intentionally stays minimal so those presets stay stable across browser updates.

What happens if Imagick on the server lacks a delegate for my format?

Some rare encoders depend on optional ImageMagick delegates. If a format is greyed out or fails with a clear error, e-mail contact@bemiv.com with your Bemiv Bulk Converter domain and we will confirm which outputs are enabled on that host.

Bemiv — Powerful Batch Image Optimization Lab

Bemiv is high-volume bulk image optimisation done deterministically. Built by a Zurich engineering practice, the toolkit you see here covers the three jobs that account for almost every routine image task on the modern web: converting between formats, resizing for a new container, and cropping to a final frame. Everything happens on a single page, with privacy by default and no account required.

Bemiv Bulk Converter exists to turn enormous image queues into ordinary background jobs. Our priority is always bulk processing, batch consistency and pipeline optimisation, and the tools below are tuned to deliver predictable, high-quality results for operations teams, marketplaces and content libraries.