Mark guide: camera-parameter watermarks in three steps

Three steps

1. Drop your photos

   Open mark.lenscript.cn/en/ and drag JPEG / PNG / RAW files onto the page, or click the dashed box to choose files. Drop several at once and switch between them in the filmstrip at the bottom.

2. Pick a style, tweak the details

   Choose one of 50 styles in the left list (see the style gallery). The top bar lets you switch JPEG / PNG, add a credit, toggle the © mark, pick or upload a logo, choose a social-media ratio, move the watermark to the top or bottom, and turn individual fields on or off. DIY Size adjusts logos (50–200%) and text (75–150%), with a reset button; fixed layouts explain their limits.

3. Download

   Click “Download” at the top right. The browser version exports the photo you are looking at — there is no zip bundle; with several files loaded, step through the filmstrip at the bottom and download each one. JPEG is re-encoded at quality 100, PNG is pixel-lossless, and resolution matches the original.

Supported input formats

JPEG, PNG, and common camera RAW files: ARW / SR2 (Sony), CR2 / CR3 / CRW (Canon), NEF / NRW (Nikon), RAF (Fujifilm), ORF (Olympus / OM System), RW2 (Panasonic), PEF (Pentax), DNG, X3F, 3FR and more.

HEIC / HEIF is not supported yet (no libheif in the browser). iPhone users: set Camera → Formats to “Most Compatible”, or convert to JPEG first.

Brand logos matched automatically

Matched from the maker and model in EXIF. 29 brands are built in:

NikonCanonSonyFujifilmPanasonicOlympusPentaxRicohHasselbladLeicaZeissDJIAppleXMAGEREDMIXiaomiOnePlusrealmeOPPOiQOOvivoSamsungGoogleHonorMEIZUnubiaZTEMotorolaASUS

Sub-brands win over parent brands (Xiaomi / REDMI, vivo / iQOO, OPPO / realme, ZTE / nubia). Co-branded marks (Huawei × Leica, OPPO × Hasselblad, OnePlus × Hasselblad) stay manual options because partnerships end — auto-matching follows current facts: Huawei defaults to XMAGE, OnePlus to OnePlus. If the match is wrong or you want your own mark, use the “Logo” control to pick one or upload a PNG.

Export quality and metadata

Full-resolution export: JPEG is re-encoded at quality 100 with no chroma subsampling (4:4:4); the photo region in PNG output is pixel-lossless. Output only grows when a border is added — it never shrinks.

JPEG exports keep cleaned EXIF, ICC colour profile and XMP; PNG exports write back camera, lens, aperture, shutter, ISO, focal length and date. GPS location is removed by default so sharing doesn’t reveal where you shot. Previews use thumbnails; exports always re-render from the original.

More than the web app

The same Rust rendering engine also ships as Windows / macOS / Linux desktop apps, an Android app and a CLI — identical output, handy for large batches or offline work. Installers and source are on GitHub (Apache-2.0).

Frequently asked questions

Is Mark free? Do I need an account?

Completely free, no sign-up or login — open the page and start. Open source under Apache-2.0.

Are my photos uploaded to a server?

No. Reading EXIF, rendering the watermark and exporting all happen in your browser via WebAssembly; the page only downloads the engine itself on first load. Photos you have opened keep working even if you go offline.

Is the export re-encoded or downscaled?

JPEG is re-encoded at quality 100 with 4:4:4 chroma; the photo region in PNG output is pixel-lossless. Both export at full resolution (the canvas only grows when a border is added).

Why isn’t my camera model detected?

Usually the photo has no EXIF: it’s a screenshot, was re-saved by an editor, or was compressed by a messaging app (WhatsApp, WeChat, etc.) which strips metadata. Use the original file from your camera or phone gallery (send as “original / document” in chat apps). If there’s truly no EXIF, type the model into the “Model fallback” box at the top.

Do phone photos work?

Yes. iPhone, Xiaomi, Huawei, OPPO, vivo, Samsung, Google Pixel and other phone photos carry EXIF and get the matching brand logo. Note that iPhone’s default HEIC format must be converted to JPEG first.

Does it support Sony / Nikon / Canon / Fujifilm / Leica watermarks?

Yes, and model names are normalised to each maker’s official style — Sony Alpha bodies show as α7C II, Fujifilm as FUJIFILM X-T5, Panasonic as LUMIX, and Nikon Z-mount bodies use the double-struck Z mark.

Can I process photos in batches?

The browser version takes several files at once and they share the current style and settings, but downloads come one at a time: Download saves the photo you are on, and there is no zip bundle. For dozens of files use the desktop or CLI build on GitHub, which process a whole folder in one go. You can also switch styles per photo.

How do I get an Instagram-friendly ratio?

Pick 1:1, 4:5, 9:16 and more under “Ratio”. Mark extends the canvas (blurred extension or solid black) to fit — your photo is never cropped.

Can I choose which fields show, and put the watermark at the top?

Yes. “Fields” toggles camera, lens, settings, date and so on; styles that support it let you switch top / bottom under “Position”. Adjustable options differ per style and the UI states clearly which parts are fixed.

Which styles work with white or high-key photos?

Shade Canopy anchors a bright photo with a pine-green info bar and a centered slot for a brand or uploaded logo. Frost Keyline uses a cool light-gray bar with graphite-colored text; Indigo Shadow uses a deep indigo-gray bar with pale text. All three preserve the full photo.

Why does my uploaded logo look small?

Transparent PNG padding is trimmed before layout. Use DIY Size to adjust the logo; opaque white backgrounds are retained. Logo size is limited by the template layout. Text size can also be adjusted, with automatic fitting for long lines.

How is this different from my phone’s built-in watermark?

Built-in gallery watermarks usually offer one fixed layout and only recognise their own brand. Mark has 50 layouts, 29 brand logos, custom logos and credits, full-resolution export, and handles camera RAW files directly.

Why won’t HEIC open?

There is no HEIC decoder in the browser build. On iPhone go to Settings → Camera → Formats and choose “Most Compatible”, or export a JPEG with the system converter.

Do exported photos keep EXIF? Will they leak my location?

JPEG keeps cleaned EXIF / ICC / XMP and PNG writes back camera info so settings stay readable later; GPS is removed by default so the shooting location is not revealed.

Is there a desktop or Android version?

Yes. Windows / macOS / Linux desktop, Android and CLI builds are released on GitHub and share the same engine as the web app, so renders are identical.

Task-by-task tutorials (on LensCript)

This page is the tool’s manual. The eight guides below are hands-on walkthroughs on the main site, with screenshots and sample frames — pick the one that matches your problem.

• Online camera settings watermark generator
• Adding an EXIF settings watermark to iPhone photos
• Fujifilm, Sony, Canon and Nikon settings watermarks
• A 4:5 border that does not crop your photo
• Adding camera watermarks to a whole set
• Why the settings disappear after you send a photo
• EXIF gone after editing: what you can still get back
• Checking EXIF and GPS before you share a photo

Open the series index →