Skip to content

JFIF to PNG converter

JFIF → PNG freezes a JPEG download into a lossless file, which suits editing and annotating but makes a photograph several times larger than the .jfif it came from.

  • Converted with Image engine · input deleted within 24 h
  • Free: 5 conversions a day · 5 MB each
  • Higher limits →

From real runs

What you get — and what changes

  • Decoded pixels Kept

    Every decoded pixel is written without further loss, which also means the JPEG blocking and ringing already in the download are preserved, not cleaned up.

  • File size Changed

    The 1,641,642-byte portrait became a 7,999,048-byte PNG and the 352,727-byte phone shot became 3,231,331 bytes; a 54,412-byte web image became 314,115 bytes.

  • Conversion time Changed

    PNG output is compressed with an extra optimisation pass, so large photos are slow: about 20 s for the 2400×3000 portrait and 29 s for the 3100×3100 Hubble image.

  • Rotation Changed

    PNG viewers do not read JPEG rotation tags, so an orientation-6 photo is turned into upright 1800×1200 pixels before it is written.

  • ICC profile Kept

    An embedded 588-byte sRGB profile in our test file was copied into the PNG's iCCP chunk, so colour-managed apps read the same colour space.

  • Camera metadata Lost

    Exif, GPS and maker notes are not written to the PNG, whatever the stripMetadata setting.

  • CMYK input Changed

    PNG has no CMYK mode, so a print-ready CMYK photo saved as .jfif is converted to RGB first; the 29,364-byte test file became a 4,113-byte RGB PNG, with print colours shifted toward screen colours.

  • Transparency Lost

    JPEG has no alpha channel, so the PNG is fully opaque; converting does not remove a white or coloured background.

Sample conversions

Large portrait

Input
grace_hopper.jfif, 1,641,642 bytes, 2400×3000 RGB with an Exif header.
Output
7,999,048-byte RGB PNG in 20 s; identical pixels to the decoded JPEG. With width 1200 the PNG was 1200×1500 and 2,660,390 bytes.

Small web image

Input
sample.jfif, 54,412 bytes, 480×600 with a JFIF header.
Output
314,115-byte PNG in 0.7 s.

CMYK print file

Input
29,364-byte 100×100 Adobe CMYK JPEG renamed .jfif.
Output
Conversion failed: PNG cannot store CMYK. The same file converted to JPG without trouble.

A real JFIF → PNG run

We converted our JFIF sample (53 KB) with Image engine on 2026-10-20. It took 1.1 s and produced a 307 KB PNG file, 5.8× larger than the input. The engine raised 1 warning, listed below.

Input · sample.jfif · 53 KB

54,412 bytes

Output · sample.png · 307 KB

480 × 600 px, 8-bit, colour type 2

Width
480
Height
600
Encoding
8-bit, colour type 2
  • Image metadata stripped from output.

Is your file a scan?

If the .jfif is a photo of a document, PNG keeps it as pixels. To get editable text, convert the image and use the screenshot-to-text workflow, which runs AI Deep Read on PNG and JPG files.

Options and when to change them

width
Give a width to shrink a large photo before it is stored losslessly; halving the width of the portrait cut the PNG to a third of its size.
height
Use with width and fit cover to crop to an exact frame, for example 1920×1080 for a slide background.
fit
contain (default) letterboxes inside the box on a transparent background; cover fills and crops; fill stretches.

Do it yourself

ImageMagick

bash
magick photo.jfif -auto-orient photo.png

For CMYK files add -colorspace sRGB so the conversion to RGB is explicit.

Python (Pillow)

bash
from PIL import Image, ImageOps

im = ImageOps.exif_transpose(Image.open("photo.jfif"))
im.convert("RGB").save("photo.png")

convert('RGB') is what makes CMYK files work; it is a plain conversion without colour management.

JFIF to PNG by API or MCP

The HTTP API and the MCP server run the exact engine this page uses (Image engine); the response carries the same warnings the web converter shows. Check support first with GET /api/v1/pairs?from=jfif&to=png.

curl
curl -X POST https://filetypeconverters.com/api/v1/convert \
  -H "Authorization: Bearer $FTC_API_KEY" \
  -F "file=@input.jfif" -F "from=jfif" -F "to=png" \
  -F 'options={"width":0}' \
  --output output.png

Options this engine accepts for JFIF → PNG

KeyApplies toTypeDefault
widthWriting PNGnumber0
heightWriting PNGnumber0
fitWriting PNGcontain · cover · fillcontain
qualityWriting PNGnumber90
backgroundWriting PNGstring#ffffff
stripMetadataWriting PNGbooleantrue
API reference

When this is the wrong conversion

  • If the picture is a photo for a website or a chat, keep it as JPG or convert it to WebP; the PNG will be several times larger with no visible gain.
  • If you hoped PNG would remove JPEG blur or blocks, it will not; ask the sender for the original file instead.
  • If you only need the file to open, rename .jfif to .jpg; that is lossless.

JFIF to PNG questions

Does converting JFIF to PNG improve the quality?

No. PNG stores exactly what the JPEG decoder produced, including compression artefacts. It only stops further loss when you edit and save the picture again.

Why is the PNG so much larger than the JFIF?

JPEG throws away detail to stay small; PNG keeps every pixel and uses lossless compression, which cannot shrink photographic noise much. The 2400×3000 portrait grew from 1.6 MB to 8.0 MB.

Will the PNG have a transparent background?

No. A JFIF image has no alpha channel, so every pixel stays opaque. Removing a background needs an editor or a background-removal tool, not a format change.

Related conversions