Start with the result, not the file extension
A file extension tells you what a file is called; it does not tell you what you need to do with it. If you only need to read a PDF, opening it locally is safer and faster than converting it again. If you need a submission-ready PDF from a text-based file, a print workflow is appropriate. For a legacy HWP document, start with an HWP-aware local preview, then compare the saved PDF with Hancom Office when the original layout must match exactly.
The same distinction applies to writing checks. A reference score can point to patterns worth revising, but it cannot prove who wrote a paragraph. The useful workflow includes a human reading pass and, for important work, the draft history and source notes.
A decision map for common document tasks
| Your goal | Start with | Verify before you finish |
|---|---|---|
| Read an existing PDF | Browser PDF viewer | Page breaks, fonts, links, and the final page count |
| Save HWPX, HTML, Markdown, or text as PDF | Local preview and print to PDF | Paper size, margins, headers, tables, and the saved PDF |
| Convert a legacy binary HWP | Document Forge's local HWP preview | Rendered pages, fonts, tables, and the saved PDF; compare with Hancom Office when layout is critical |
| Review whether prose has repetitive patterns | Writing-signal reference | Sample length, language, draft history, and a human review |
| Meet an application character limit | Character counter | The destination form's own rule for spaces, line breaks, and emoji |
| Send a smaller image or a group of files | Image compression or ZIP bundling | The measured output size and whether the recipient can open it |
Three worked choices
1. A Korean application form asks for a PDF
First identify whether the source is HWP, HWPX, DOCX, or already a PDF. For HWPX, preview the extracted text and use the browser print dialog to create a PDF. Set the paper size expected by the form, keep the scale at the intended value, and open the saved file again. Count the final text separately if the form has a character limit. Keep the original document beside the PDF until the upload is accepted.
2. A manager asks whether a draft “looks like AI”
Do not turn a detector number into a personnel decision. Use a writing-signal check only as an editing prompt: look for unusually uniform sentence lengths, repeated connectors, generic transitions, and paragraphs that all end in the same rhythm. Compare the current draft with the author's notes and earlier versions. If the question affects employment, grading, or discipline, use a qualified human review and the normal evidence process.
3. An email rejects a file because it is too large
Check the actual largest file first. JPEG, PNG, MP4, PDF, DOCX, XLSX, and HWPX are already compressed in common cases, so putting them in a ZIP may only bundle them. A phone photo usually benefits from resizing or a measured WebP/JPEG export. A set of plain text, CSV, logs, BMP, or SVG files may benefit from ZIP compression. Compare the output bytes; never rely on a percentage that was not measured from your files.
When a browser-first path is the safer choice
Browser processing is a good default when the task is previewing HWP or HWPX, reading text, counting characters, checking a PDF, compressing an image, or creating a ZIP. The file can stay in the current session, which removes an upload and a retention policy from the decision. It does not make the device automatically safe: shared computers, browser extensions, downloaded copies, and the destination you eventually send the file to still matter.
Use a server-assisted converter only when the file format or fidelity requirement genuinely needs it. Before selecting one, look for an identifiable operator, a clear privacy notice, a retention period, a supported-format list, an error path, and a way to delete or avoid stored uploads. A service that claims to convert every format perfectly without describing its boundary is not giving you enough information to verify the result.
Finish with a verification pass
- Open the output from the beginning, not only the first page.
- Check non-Latin text, punctuation, links, tables, and page breaks.
- Compare the output size with the original and confirm the filename and extension.
- For writing analysis, read the explanation and record the sample length; do not save only the score.
- Keep the original and remove temporary copies from shared devices when the task is complete.
Document Forge follows this boundary in the interface: local browser tools show what they actually extracted or measured, supported binary HWP files are rendered locally and shown before PDF saving, and the writing result is labelled as a reference signal rather than a verdict. See the about page for the implementation boundaries and the privacy notice for the data paths.