A job application is usually judged by a recruiter who opens one file, on a laptop, for about half a minute. That makes the delivery part of the application: one PDF, a sensible page order, page numbers, and a size the portal will accept without an error message.
The order is build, merge, number, then compress. Building certificate pages before merging keeps the merge clean, numbering after merging means the numbers match the final page count, and compressing last means you shrink the finished document once instead of twice. Every step runs in the browser, which matters for a file that carries your address, phone number and scanned ID.
1. Build a PDF from scans and photos
Certificates, transcripts and ID pages often exist only as phone photos. Image to PDF turns each image into a page and writes one document, which is the format every application portal expects. Add the files, drag the cards into reading order, then choose A4 or Letter, portrait or landscape, the margin, and whether each image should fit inside the page or fill it.
JPG and PNG files are embedded as they are, without re-encoding, while WebP, AVIF, GIF and BMP are converted in the browser first. No fixed image count is imposed, so a long certificate set is one run; the practical ceiling is your memory because every page is held locally.
One thing to fix before you start: the tool has no perspective correction, so a certificate photographed at an angle stays skewed. Image Cropper can rotate in 90 degree steps and trim the frame, but it cannot square up a trapezoid, so the reliable fix is to photograph the document flat and straight on.
Image to PDF
Turn certificate and ID photos into clean pages, set the order and page size, then download one PDF.
2. Merge the whole application into one file
Most portals take one upload, not four. Merge PDF joins the resume, the cover letter and every certificate PDF into a single document, in the order you drag the cards. Pages are copied across as they are, so fonts, spacing, selectable text and hyperlinks survive the merge unchanged.
Order the file the way a recruiter reads it: resume first, cover letter second, then certificates in reverse chronological order. Put the reference letters last, because they are checked after the first screening rather than before it. There is no fixed file limit, though a very large set is better merged in one pass than repeatedly appended, because each merge rewrites the whole document.
The limit 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 resume, cover letter and certificates into one file, in the order you set.
3. Number the pages so nothing gets out of order
Add Page Numbers stamps a new text layer on every page. Set the starting number, a format that can include the total page count, the font size and the font, and skip the first page when it is a cover letter rather than a numbered section. The original content is never flattened, so text underneath stays selectable.
This matters less for a digital read and more for the interview: once a recruiter prints the file, loose pages lose their order. Numbering gives a printed set an obvious sequence. The tool only adds text, it does not change what the resume says, and an encrypted PDF has to be unlocked first.
4. Compress to the portal's limit
Do this once, at the end. Compress PDF rewrites the internal structure with qpdf: objects are packed into object streams, streams that were stored uncompressed are compressed, and the cross-reference tables are rebuilt. Text, links and images stay as they are, because nothing is re-encoded. Standard uses compression level 6; Maximum uses level 9 and also linearizes the file so a reader can show the first page before the download finishes.
How much you gain depends on what the file is made of. A text based resume exported from a word processor usually has slack to remove, while a scan heavy certificate set barely moves, because the pages are already compressed images. If the result is still over the limit, lower the scan resolution and rebuild the certificate pages, or run those photos through Image Compressor before merging. The compression here is structural, not a magic size box.
Two limits to know. There is no target size field, so you cannot type 2 MB and get exactly that; you apply a mode and check the number. And a cryptographically signed PDF is invalidated by any rewrite, so a signed reference letter has to be sent as its own untouched copy. The dedicated guide on getting a resume PDF under a size limit goes deeper into the trade-offs.
Compress PDF
Shrink the finished application with a lossless structural rewrite, in the browser.
What an application PDF exposes
A resume carries a name, a phone number, an address and often a date of birth. A certificate set can carry an ID number. None of that has any business being uploaded to an unknown server just to be merged, which is the practical reason every step on this page runs locally. The Cloud AI tools are the only part of the site that uploads, and an application workflow never needs them.
Hidden metadata is the other half. PDF Metadata can clear the Title, Author, Subject, Keywords, Creator and Producer fields that readers show under document properties, and Remove EXIF strips camera, device and GPS data from JPEG and PNG files before they become pages. What the metadata tool does not reliably remove is an XMP packet or custom keys written by a scanner or an Adobe product, and it is not encryption. If a file contains something you would not want forwarded, edit the source and export a clean copy rather than trusting a strip pass.
What these tools cannot do
- No resume or cover letter writing. These tools change file formats. They do not draft, score or reformat a document.
- No editing of existing PDF text. You cannot reword a line inside a PDF. You can merge, split, number, watermark and sign on top of it.
- No application form filling. There is no integration with an applicant tracking system, and no way to submit on your behalf.
- No handwriting recognition for certificates. A handwritten reference is treated as a picture, not as text.
- No guarantee that every metadata field is gone. The PDF tool covers the document information dictionary, not every XMP packet.
- No target file size. Compression reports what it achieved; it cannot promise a number in advance.