ZIP Download
Let people select several files and download them as one archive.
What it adds
A multi-select download that packages the chosen files and folders into a single archive.
What your agent is told to do
5
What your agent is told to do
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1
Hang the action off the app's existing multi-select and Bulk Actions machinery. Users already know how to tick rows, and a separate selection mode for downloads will diverge from the rest of the list.
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2
Re-check every file against the requesting user's permissions at build time, not only at selection time. Reuse the app's Secure File Downloads path for each member rather than reading from storage directly.
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Show the total size and file count before the download starts, and let the user cancel a build that is still running.
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4
Name the archive after what was selected and the date, so a folder of ten downloads is still navigable a week later.
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5
Do not offer this as a way to export the entire account. That is a different feature with different expectations, and the app's Personal Data Export already covers it.
Edge cases it handles
8
Edge cases it handles
8- Building the whole archive in memory before sending it will exhaust the process on a large selection and stall every other request on that worker. Stream entries out as they are read so memory stays flat regardless of selection size.
- Two files from different folders can share a filename, and the archive will end up with a silent duplicate or a truncated one. Preserve the folder structure inside the archive, and where a collision still occurs, disambiguate the name rather than dropping the file.
- Without a ceiling on total size and file count someone will select forty thousand files and hold a connection open for an hour. Set explicit limits, state them before the attempt, and explain what to deselect rather than failing at the end.
- An archive that takes minutes to assemble should not be built on the request. Move it to background work, then send the user a link when it is ready, with an expiry on that link and the same permission check on redemption.
- Non-Latin and accented filenames come back as replacement characters in some extraction tools. Write entry names in a Unicode-safe encoding and test with Cyrillic, Japanese, and accented Latin names before calling it done.
- A stream that fails midway produces a downloaded file that looks complete and opens corrupt. Detect the failure, avoid presenting a partial archive as finished, and let the user retry.
- A user who navigates away or loses connection mid-download must not leave a half-written temporary file behind on the server forever.
- An empty selection, or one where every file has since been deleted, must produce a clear message rather than an archive with nothing in it.
Definition of done
9
Definition of done
9- Selecting several files and downloading produces one archive containing exactly those files.
- The archive is streamed and server memory does not scale with selection size.
- Folder structure is preserved inside the archive and filename collisions are disambiguated.
- Size and file-count limits are stated before the attempt and enforced.
- Long builds run in the background and deliver an expiring link that re-checks permissions.
- Non-Latin filenames extract correctly on common desktop tools.
- A failed build is reported rather than delivered as a truncated archive.
- The feature matches the existing design system.
- No existing functionality is broken.
Related features
PDF Converter
PDF Converter
Let people turn the files they upload into PDFs, and PDFs back into editable formats.
What it does
A conversion service that accepts an uploaded document and returns it in a requested format, with progress and a downloadable result.
How it works
- 1 Start from the app's existing upload path rather than adding a second one. If File Upload, Upload Malware Scanning, or Secure File Downloads already exist, the converter consumes what upload produces and hands its output to the existing download route, so permissions and scanning are inherited rather than reimplemented.
- 2 Decide the conversion pairs you will actually support and list them in the interface. A short honest list of office documents, images, and PDF to text beats a control that offers every combination and fails on most of them.
- 3 Enforce file size, page count, and accepted types on the server before any conversion starts. A limit checked after the file has been parsed has already cost you the memory and the CPU you were trying to protect.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/pdf-converter
Fillable PDF Forms
Fillable PDF Forms
Let people fill in a PDF form on screen and download the completed copy.
What it does
An on-screen fill layer over a PDF form that writes the entered values back into a downloadable file.
How it works
- 1 Render the document and place editable inputs over its real form fields, so the user types on the page they recognise rather than into a separate form beside it.
- 2 Extend the app's existing PDF Export and document viewing paths rather than introducing a second renderer. Two renderers will disagree about fonts and page size, and the user will see the difference between screen and download.
- 3 Save progress as the user types using the app's existing Autosave, and restore the partly filled form on return.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/fillable-pdf-forms
Document Scanner
Document Scanner
Turn a phone photo of a paper document into a straight, readable, multi-page file.
What it does
A camera capture flow that detects page edges, corrects perspective, and assembles the shots into one document.
How it works
- 1 Lead with the capture screen: live edge detection, a shutter, and a running strip of the pages already taken. Somebody should be able to shoot five pages without leaving the camera.
- 2 Correct perspective and crop to the detected page before saving, then apply a contrast pass so a grey photo of a page reads as black text on white.
- 3 Give the user a review step where pages can be reordered, retaken, or deleted before anything is committed.
Copy the prompt
No account needed
Add this feature to my app:
https://addthisfeature.com/x/document-scanner
How it works
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1
Copy the link
Grab the Markdown instruction URL for this feature.
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2
Give it to your AI
Paste it into Claude Code, Cursor, v0, Lovable — whatever you build with.
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3
It inspects, then implements
Your agent reads your existing app first, then adds the feature to fit it.
Works with your stack
These instructions are written to adapt. They tell the agent to detect your framework, match your existing design system, and reuse what you already have — rather than assuming a particular stack.
Need it tighter than that? Customize the feature and tell it exactly what you're running.