Next step · What to do next

Let people upload files or photos safely

What you may see

Customers should send a photo, a design or a document

Why this step

Uploads are a way into your system: they need limits, type checks, private storage and short-lived links.

Before you start

Which file types and sizes do you really need?

The prompt for this step

What you type here never leaves your browser. The search runs on this page, and nothing is sent to a server or to an AI.

Any error or warning you see now

What you have now (tool, framework, where it is hosted)

Kept only in this browser, on this device. Keys and passwords are removed before anything is saved.

Prompt language

You are a senior engineer and careful product advisor who builds small business websites and apps, and explains every step to people who are not developers. I am not a developer, so explain every step in plain words and tell me exactly which button, menu or command you mean. If you are not sure about something, say so; do not guess.

WHAT I WANT NEXT
Let people upload files or photos safely

ANY ERROR OR WARNING I SEE NOW (write "none" if there is none)
[paste the exact error here]

WHAT I HAVE NOW (the tool I used, the framework, where it is hosted)
[write in a few words what you did before it happened]

WHY THIS STEP
Uploads are a way into your system: they need limits, type checks, private storage and short-lived links.

DO THESE STEPS, IN THIS ORDER
1. Allow only the needed types and a maximum size, checked on the server by the real content (not only the file name).
2. Store files in private storage with random names, upload straight to storage with a short-lived upload address, and serve them through short-lived signed links.
3. Shrink images in the browser, show progress and clear errors in both languages, and limit uploads per person and day.
4. Plan clean-up of old files and never run uploaded files as code.
Stop and tell me if what you see does not match a step. Do not skip ahead.

CHECK THAT IT WORKED
- Allowed files upload and show, a renamed wrong-type file is refused, and files are not public by default.
Tell me exactly what I should see on the screen when it works.

DO NOT CHANGE
- Do not trust file names or types sent by the browser.
- Anything I did not ask about: the design, the text, other pages, other settings or the data.
- Do not delete files, data or branches, do not reset or force-push, and do not rewrite history, unless you first show me exactly what would be lost and I say yes.
- Do not paste, print or ask me to paste a password or secret key into this chat. If one is needed, tell me which settings page of the right service to store it in.

WHEN YOU FINISH
Explain in simple words what you changed (file by file or setting by setting), why you changed it, and how I can undo it.

Paste it into Claude, ChatGPT, Gemini or Cursor, then follow what it says.

After you tried it, did it work?

Steps

Allow only the needed types and a maximum size, checked on the server by the real content (not only the file name).
Store files in private storage with random names, upload straight to storage with a short-lived upload address, and serve them through short-lived signed links.
Shrink images in the browser, show progress and clear errors in both languages, and limit uploads per person and day.
Plan clean-up of old files and never run uploaded files as code.

Do not do this

Do not make the upload folder public.
Do not trust file names or types sent by the browser.

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