School paperwork arrives in three shapes: a PDF nobody can open on a phone, a photo of a form that has to be sent back, and a portal that rejects anything over a few megabytes. Three steps cover the whole loop. Turn pages into images for a chat, combine forms into one PDF, then compress it to the limit.
The order matters. Convert or crop first, merge second, compress last. Compressing before merging means you compress twice, and merging a photo that is still 6000 pixels wide leaves a file that has to be shrunk again anyway. None of these steps uploads anything, which matters when the documents carry a child's name, date of birth and address.
When the school sends a PDF nobody can read on a phone
Group chats preview pictures, not documents, so a letter that arrives as a PDF often gets no reaction at all. PDF to JPG renders each page on a canvas in your browser and exports it as an image, which the chat can display inline.
Pick the resolution to match the job: 72 DPI is screen size, 150 DPI reads comfortably on a phone and is the usual choice, and 300 DPI is for anything that may be printed. Type a page range such as 1-3,5 when only part of the letter matters. JPG gives smaller files; PNG keeps thin lines and small text crisp.
Two limits. The result is a picture, so text is no longer selectable or searchable, which is fine for a chat but wrong for a form that has to be filled digitally. And a page that would exceed 40 megapixels at the chosen resolution is reported instead of rendered, so an oversized scan has to be converted at a lower DPI. Keep the original PDF for your records.
PDF to JPG
Turn letter pages into images at 72, 150 or 300 DPI, with a page range and no upload.
Turn a paper form into a page you can send back
A signed permission slip or a medical form is paper, and the school wants it back as a file. Image to PDF turns the photo into a page and writes one document, with A4 or Letter, portrait or landscape, a margin and a fit option so the page does not end up half empty.
JPG and PNG photos are embedded as they are, while WebP, AVIF, GIF and BMP are converted first. There is no fixed image count, so a multi-page form is a single run, though every page is held in memory. Crop the table and your fingers out before you build the PDF, because cropping a page after it is inside the PDF means exporting it back to an image.
One honest limit: there is no perspective correction. A form photographed at an angle stays skewed, and Image Cropper can only rotate in 90 degree steps and trim the frame. Put the paper flat on a table and shoot straight down.
Image to PDF
Turn a photographed form into a clean A4 or Letter page, then download the PDF.
Combine everything into one file
Registration packets ask for one upload, not six attachments. Merge PDF joins the school notice, the filled form and the supporting documents into a single PDF, in the order you drag the cards. Pages are copied as they are, so a form keeps its layout and its selectable text.
Put the file in the order the school office will read it: the notice or cover page first, the completed form second, then certificates and ID copies. There is no fixed file limit, and merging keeps links and bookmarks intact.
The one blocker is encryption. A password protected PDF has to be unlocked before its pages can be read, so remove the password first and merge the unprotected copy.
Merge PDF
Join the notice, the form and the certificates into one file, in the order you choose.
Compress to the portal limit
Do this once, at the end. Compress PDF rewrites the internal structure with qpdf: objects are packed into object streams, uncompressed streams are compressed, and the cross-reference tables are rebuilt. Text and links stay as they are, because nothing is re-encoded. Standard uses compression level 6; Maximum uses level 9 and also linearizes the file. The tool is designed for files under 50 MB.
How much you gain depends on what is inside. A letter exported from a word processor often has slack to remove, while a set of scanned certificates barely moves, because those pages are already compressed images. If the portal still rejects it, run the photos through Image Compressor before building the PDF, or re-export the scan at a lower DPI.
Two limits. There is no target size field, so you apply a mode and read the result rather than typing a number. And any rewrite invalidates a cryptographic signature, so a digitally signed document has to be sent as its own untouched copy.
Compress PDF
Shrink the combined file with a lossless structural rewrite, in the browser.
Before you send: what is inside the file
A photo of a form carries more than the form. Phone cameras write GPS coordinates, device model and capture time into the file, and that metadata travels with the page. Remove EXIF strips it from JPEG and PNG without re-encoding the pixels, and the default mode keeps the ICC colour profile so the page still looks right.
A PDF has its own hidden fields. PDF Metadata can clear the Title, Author, Subject, Keywords, Creator and Producer entries that readers show under document properties. What it does not reliably remove is an XMP packet written by a scanner, and it is not redaction: a name or an address printed on the page is still there.
That distinction matters for school documents, which often carry a child's full name and date of birth. If something on the page should not be shared, edit the source and export a clean copy rather than relying on a metadata pass. And keep the Cloud AI tools out of this workflow entirely, because those upload by design and consume credits.
What these tools cannot do
- No form filling or document creation. These tools change files. They do not fill a school form, write a letter or produce a certificate.
- No editing of existing PDF text. You cannot correct a line inside a PDF. You can merge, split, convert, number, watermark and sign on top of it.
- No redaction. Stripping metadata does not hide printed content, and drawing a black box over text is not one of the tools here.
- No perspective correction. A form photographed at an angle stays skewed. Shoot it flat and straight on instead.
- No handwriting recognition on forms. A filled-in form is treated as a picture, not as text, so its answers cannot be extracted.
- No target file size. Compression reports what it achieved; it cannot promise a portal's exact limit in advance.
- No submission. Nothing is sent anywhere. You download the file and upload it yourself.