Which Photo Sizes and Formats Event Guests Actually Need
TIME&SPACE · Photographer's Edge
Most event galleries deliver one file size to everyone. Guests want something they can post in ten seconds. Sponsors and press want something that survives print.
Which Photo Sizes and Formats Event Guests Actually Need
In short: Three sizes cover almost every real use. A small preview for browsing, a mid-size file for posting, and the full resolution original for anyone who needs to print or license it. Delivering only one of the three fails somebody, and usually it is the guest on a phone.
The question of what to deliver rarely gets decided. It gets inherited from whatever the export preset happened to be.
That is how galleries end up serving 40 megabyte files to a person standing in a venue on a saturated network, or 900 pixel JPEGs to a magazine that asked for the shot.
The three uses, and only three
Guests want to post. They open the gallery on a phone, find themselves, and want the file on their camera roll in the next few seconds. Resolution beyond what a phone screen and a social upload will use is not a benefit to them. It is a wait.
Organisers and sponsors want to publish. Recap emails, decks, a website, printed material at the next edition. That needs real resolution and it needs to arrive without a call.
Press and licensing want the original. Rare, but when it happens it is the shot that matters and a downsized copy is useless.
Almost every requirement anyone brings you is one of those three.
What each one should be
Thumbnail or preview. A few hundred pixels on the long edge. Its only job is to load fast in a grid so a person can scan a gallery without waiting. Nobody downloads it.
Web or share size. Around 1200 to 2000 pixels on the long edge, quality 80 to 85 JPEG. This is the file most people leave with. It is sharp on any phone, it survives a social upload, and it is small enough to save over event wifi. If you deliver only one size, deliver this one.
Original. Full resolution, full quality, straight from your export. It exists for the people who need it and it should not be what a guest gets by default.
The exact numbers matter less than the gap between them. What breaks delivery is having no gap at all.
Format: JPEG, still
There is a real temptation to deliver something more modern. WebP and AVIF produce smaller files at the same visible quality, which sounds like exactly what event delivery wants.
Use them for what the browser renders, by all means. Do not use them for what the guest downloads.
A JPEG opens in every phone gallery, every editing app, every email client, every printer, and every piece of software a sponsor's marketing team has. A file a guest downloads and cannot open is worse than a slightly larger one. Save the format experiments for the layer nobody has to touch.
HEIC has the same problem in reverse. If you shoot it, convert on the way out.
PNG is not the answer
PNG is lossless, which reads like the safe choice, and for photographs it produces files several times larger with no visible gain. It exists for graphics with flat colour and hard edges: logos, screenshots, anything with transparency.
A watermarked photograph is still a photograph. Deliver it as a JPEG.
Colour space, the quiet one
Export guest-facing files as sRGB.
Adobe RGB and ProPhoto hold more colour, and they hold it correctly only in software that understands the profile. Everything else guesses, and a guess renders your reds flat and your skin tones grey. The guest sees a dull photograph, decides your work is dull, and does not post it.
Keep the wide gamut in your archive. Ship sRGB.
The one that gets skipped
Whatever your gallery serves as the preview should not be what it serves when someone taps to view a photograph full screen. That is a small distinction and it is the single most common quality complaint in event delivery: a guest opens an image, sees a soft blurry version of a shot you spent hours getting right, and concludes the photography was bad.
It usually is not the photography. It is a thumbnail being asked to do a job it was never sized for.
Check it on your own delivery. Open one photograph full screen on a phone and look at the detail.
A working default
Deliver three: a preview for the grid, a share size around 1600 pixels for the download button, and the original available on request. JPEG, sRGB, quality 80 to 85 on the share size.
That covers the guest, the organiser, the sponsor, and the one journalist who emails in November. It also keeps the total upload manageable, which matters more than most people expect when the connection is the venue's rather than your own.
While you are setting the preset, decide what rides inside the file too. That is the metadata question, and it is a different decision with the same characteristic: made once, applied forever, or never made at all.
The sizing decision is worth ten minutes, once. Then it is done for every event you shoot after it, and one of the quiet reasons guests actually download and share what you made.
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