How to Compress & Convert Images Without Losing Quality in 2026
Learn practical, verifiable techniques to resize, compress, and convert web images into WebP and AVIF without sacrificing visual clarity.
Read guideOFFICIAL UK BIOMETRIC SPEC
Processing: Server-processed (Encrypted HTTPS)TOOL OVERVIEW
His Majesty’s Passport Office (HMPO) requires standard printed UK passport photos to measure exactly 35 mm wide by 45 mm high (413 × 531 pixels at 300 DPI), with the distance from the bottom of the chin to the crown of the head measuring between 29 mm and 34 mm.
UK biometric rules require a plain cream or light grey background (for printed photos) or plain light-colored wall without shadows, neutral facial expression with mouth closed, and no spectacles or glare.
TECHNICAL SPECIFICATIONS & LIMITS
Below are the verified technical parameters, batch limits, and processing details for UK Passport Photo (35x45 mm):
| Specification | Technical Behavior |
|---|---|
| Processing Architecture | Server-processed via encrypted HTTPS API (ephemeral memory, deleted within 30 minutes) |
| Accepted Input Formats | JPG, JPEG, PNG, WEBP |
| Output Format | High-resolution 300 DPI JPEG (.jpg) |
| Batch Processing Limit | 10 files per batch |
| Configurable Parameters | Country (pakistan, usa, uk, schengen, india, canada…); DPI (72–600, default 300); Output format (jpeg, png, webp) |
| Transparency / Alpha Handling | Flattened onto solid background (JPEG does not store an alpha channel) |
This page pre-selects the "UK" preset (35 × 45 mm) in our Passport Photo tool. Upload a well-lit front-facing portrait and generate a print-ready or portal-ready biometric image in seconds.

REFERENCE MATRIX
| Specification | Official Requirement | Toolcolabs Preset |
|---|---|---|
| Physical Print Size | 35 × 45 mm (Width × Height) | UK (35 × 45 mm) Pre-selected |
| Digital Resolution (300 DPI) | 413 × 531 pixels at 300 DPI | 413 × 531 px (300 DPI JPEG) |
| Official Authority | HM Passport Office (HMPO — United Kingdom) | Supported |
| Official Specification Source | UK Government Passport Photo Guidance (gov.uk/photos-for-passports) & ICAO Doc 9303 | Verified HMPO Ratio |
| Head Height & Background Rule | Crown-to-chin 29–34 mm; plain cream or light grey background; no glasses glare or shadows | Biometric Center Framing |
Questions and answers
An official UK passport photo measures 35 × 45 mm, which corresponds to 413 × 531 pixels at 300 DPI print and portal resolution.
HM Passport Office guidance specifies a plain cream or light grey background so that there is clear contrast around the applicant’s hair and face without harsh flash shadows.
Your head from the bottom of the chin to the crown of the head (ignoring top hair volume) must measure between 29 mm and 34 mm vertically.
HM Passport Office advises removing glasses completely. If you must wear prescription glasses for medical reasons, your eyes must be fully visible with zero reflection, glare, or frame obstruction.
This tool crops and scales your portrait to the official 35 × 45 mm (413 × 531 px) UK frame. To change your background color first, use our Change Background tool.
Yes. Uploaded images are processed over encrypted HTTPS and automatically purged from temporary server storage within 30 minutes.