# PDF.co Help Center

> Help center for PDF.co

## Account & Access

- [How to Sign Up for a PDF.co Trial Account](https://support.pdf.co/en/articles/11274235-how-to-sign-up-for-a-pdf-co-trial-account.md)
- [I Didn’t Receive My One-Time Code](https://support.pdf.co/en/articles/11141300-i-didn-t-receive-my-one-time-code.md)
- [Can I Turn Off or Change Credit Alert Emails?](https://support.pdf.co/en/articles/11141298-can-i-turn-off-or-change-credit-alert-emails.md)
- [How Can I Change My Email Address?](https://support.pdf.co/en/articles/11274442-how-can-i-change-my-email-address.md)
- [Can I Set Up Multiple Accounts for My Agency or Clients?](https://support.pdf.co/en/articles/11141301-can-i-set-up-multiple-accounts-for-my-agency-or-clients.md)
- [Can I Appoint Another User to Manage My PDF.co Account?](https://support.pdf.co/en/articles/11141302-can-i-appoint-another-user-to-manage-my-pdf-co-account.md)
- [How Can I Reset My PDF.co Password?](https://support.pdf.co/en/articles/11141306-how-can-i-reset-my-pdf-co-password.md)
- [How to check remaining credits?](https://support.pdf.co/en/articles/11141307-how-to-check-remaining-credits.md)
- [Do you still support ByteScout SDK?](https://support.pdf.co/en/articles/11141207-do-you-still-support-bytescout-sdk.md)
- [Artifex Software and ByteScout / PDF.co Merger FAQ](https://support.pdf.co/en/articles/11141209-artifex-software-and-bytescout-pdf-co-merger-faq.md)
- [Do I need to request an API key for testing, training, or projects?](https://support.pdf.co/en/articles/12496201-do-i-need-to-request-an-api-key-for-testing-training-or-projects.md)

## Billing & Subscription

- [Why Can't I Buy a Credit Pack?](https://support.pdf.co/en/articles/11374456-why-can-t-i-buy-a-credit-pack.md): Use this article for questions about why credit packs may not be available, available credit pack options, and how Smart Credit Refill can automatically top up credits to keep workflows running smo...
- [What Are Credits in PDF.co?](https://support.pdf.co/en/articles/11141291-what-are-credits-in-pdf-co.md)
- [Want to Reduce Your PDF.co Credit Usage?](https://support.pdf.co/en/articles/11141287-want-to-reduce-your-pdf-co-credit-usage.md)
- [Do PDF.co Credits Expire?](https://support.pdf.co/en/articles/11141294-do-pdf-co-credits-expire.md)
- [How to Manage Your Billing Info and Invoices?](https://support.pdf.co/en/articles/11274640-how-to-manage-your-billing-info-and-invoices.md)
- [How can I pause my subscription?](https://support.pdf.co/en/articles/11141304-how-can-i-pause-my-subscription.md)
- [How Are Credits Spent for Async Jobs?](https://support.pdf.co/en/articles/11274643-how-are-credits-spent-for-async-jobs.md)
- [How many credits do I need?](https://support.pdf.co/en/articles/11141295-how-many-credits-do-i-need.md): Learn how to estimate PDF.co API credit usage by endpoint. See how many credits each API function uses and whether the charge is per page or per API call.
- [How do I get notified when I'm running out of credits?](https://support.pdf.co/en/articles/11141297-how-do-i-get-notified-when-i-m-running-out-of-credits.md)
- [Why isn’t my VAT ID showing on my invoice after I updated it in the portal?](https://support.pdf.co/en/articles/11329438-why-isn-t-my-vat-id-showing-on-my-invoice-after-i-updated-it-in-the-portal.md)
- [How to Remove or Change Your Payment Method](https://support.pdf.co/en/articles/12496122-how-to-remove-or-change-your-payment-method.md)
- [What happens to my credits after my subscription is cancelled?](https://support.pdf.co/en/articles/12889276-what-happens-to-my-credits-after-my-subscription-is-cancelled.md)

## Troubleshooting & Error Codes

- [PDF.co API Error Codes and How to Fix Them](https://support.pdf.co/en/articles/11324359-pdf-co-api-error-codes-and-how-to-fix-them.md)
- [Error: NoSuchKey – The specified key does not exist](https://support.pdf.co/en/articles/11141246-error-nosuchkey-the-specified-key-does-not-exist.md)
- [Error: Unable to download the file - The URL returned a 404 \(Not Found\) error](https://support.pdf.co/en/articles/11315903-error-unable-to-download-the-file-the-url-returned-a-404-not-found-error.md)
- [Error: Access Denied](https://support.pdf.co/en/articles/11141254-error-access-denied.md)
- [Maximum Number of Repeats Exceeded in Make.com](https://support.pdf.co/en/articles/11141240-maximum-number-of-repeats-exceeded-in-make-com.md)
- [Error: Timeout – Service Is Temporarily Unavailable](https://support.pdf.co/en/articles/11141244-error-timeout-service-is-temporarily-unavailable.md)
- [I’m Getting ‘templateData is not valid JSON’ When Creating PDF from HTML Template](https://support.pdf.co/en/articles/11315908-i-m-getting-templatedata-is-not-valid-json-when-creating-pdf-from-html-template.md)
- [When converting From HTML to PDF, I Get A “JSON Malformed Error”](https://support.pdf.co/en/articles/11315922-when-converting-from-html-to-pdf-i-get-a-json-malformed-error.md)
- [ECONNREFUSED Error](https://support.pdf.co/en/articles/11141243-econnrefused-error.md)
- [PHP - Peer certificate cannot be authenticated](https://support.pdf.co/en/articles/11141252-php-peer-certificate-cannot-be-authenticated.md)
- [PHP – SSL Certificate Error: Unable to Get Local Issuer Certificate](https://support.pdf.co/en/articles/11141249-php-ssl-certificate-error-unable-to-get-local-issuer-certificate.md)
- [Fatal error: Uncaught ValueError - Path cannot be empty](https://support.pdf.co/en/articles/11141238-fatal-error-uncaught-valueerror-path-cannot-be-empty.md)
- [I’m Getting a “Please Set URL to the Link to a Source File” Error in Postman](https://support.pdf.co/en/articles/11316034-i-m-getting-a-please-set-url-to-the-link-to-a-source-file-error-in-postman.md)
- [Getting 'Paged is Not Defined' Error When Converting HTML to PDF](https://support.pdf.co/en/articles/11323618-getting-paged-is-not-defined-error-when-converting-html-to-pdf.md)
- [Fieldname Must Not Be Empty Error When Filling PDF Form in Zapier](https://support.pdf.co/en/articles/11324100-fieldname-must-not-be-empty-error-when-filling-pdf-form-in-zapier.md)
- [Why am I getting a "GeneralError: Document parsing failed. Please retry" error when trying to parse my invoice with your AI?](https://support.pdf.co/en/articles/11476815-why-am-i-getting-a-generalerror-document-parsing-failed-please-retry-error-when-trying-to-parse-my-invoice-with-your-ai.md)
- [HTML to PDF json malformed error](https://support.pdf.co/en/articles/11141176-html-to-pdf-json-malformed-error.md)
- [HTML to PDF how to avoid a picture to break](https://support.pdf.co/en/articles/11140995-html-to-pdf-how-to-avoid-a-picture-to-break.md)
- [NolnvoiceError: The specified document does not contain invoice data](https://support.pdf.co/en/articles/11996297-nolnvoiceerror-the-specified-document-does-not-contain-invoice-data.md): Fix 'NolnvoiceError' when parsing non-invoice documents. Learn why it happens and find alternative PDF.co APIs \(Document Parser, PDF-to-JSON
- [Error 400 – Bad Request](https://support.pdf.co/en/articles/11141248-error-400-bad-request.md)
- [Error 401 Unauthorized](https://support.pdf.co/en/articles/11315941-error-401-unauthorized.md)
- [Error 402: Not Enough Credits](https://support.pdf.co/en/articles/11315994-error-402-not-enough-credits.md)
- [Error 408 Timeout Error in Make.com](https://support.pdf.co/en/articles/11316052-error-408-timeout-error-in-make-com.md)
- [I’m Getting a "Rate Limit Error 429 – Too Many Requests"](https://support.pdf.co/en/articles/11141293-i-m-getting-a-rate-limit-error-429-too-many-requests.md)
- [Error 442: Input Document Is Damaged or of Incorrect Type](https://support.pdf.co/en/articles/11141236-error-442-input-document-is-damaged-or-of-incorrect-type.md)
- [Getting “Error 442” When Using Salesforce File Link in API](https://support.pdf.co/en/articles/11141241-getting-error-442-when-using-salesforce-file-link-in-api.md)
- [Error 448 - Web Page Not Found](https://support.pdf.co/en/articles/11141245-error-448-web-page-not-found.md)
- [Understanding and Resolving the 408 – Request Timeout Error](https://support.pdf.co/en/articles/12609937-understanding-and-resolving-the-408-request-timeout-error.md)

## Workflow & Automation

- [How to Download Output Files from API Requests](https://support.pdf.co/en/articles/11996326-how-to-download-output-files-from-api-requests.md): Learn how to download, preview, and save output files from PDF.co API responses, including handling temporary URLs and expiration times
- [How to Maintain Original Image Dimensions When Converting PDF to PNG](https://support.pdf.co/en/articles/12270725-how-to-maintain-original-image-dimensions-when-converting-pdf-to-png.md)
- [Understanding the 7-File Limit in the PDF Module on Make.com](https://support.pdf.co/en/articles/12534444-understanding-the-7-file-limit-in-the-pdf-module-on-make-com.md)
- [How to Delete the Last Page of a PDF When the Page Count Varies](https://support.pdf.co/en/articles/12844755-how-to-delete-the-last-page-of-a-pdf-when-the-page-count-varies.md): How to Delete the Last Page of a PDF When the Page Count Varies
- [How to Avoid Timeout Errors When Merging a Large Number of PDFs](https://support.pdf.co/en/articles/12895227-how-to-avoid-timeout-errors-when-merging-a-large-number-of-pdfs.md)
- [How Can I Process PDFs Without a Third-Party Server?](https://support.pdf.co/en/articles/15881168-how-can-i-process-pdfs-without-a-third-party-server.md): If your documents cannot be sent to a third-party server, Ghostscript can help you process PDFs inside your own infrastructure.
- [My PDF.co Output Link Expires—How Can I Keep It Permanent?](https://support.pdf.co/en/articles/11318711-my-pdf-co-output-link-expires-how-can-i-keep-it-permanent.md)
- [How do I change the output link expiration in Zapier or Make.com?](https://support.pdf.co/en/articles/11141227-how-do-i-change-the-output-link-expiration-in-zapier-or-make-com.md)
- [Where Can I Find the PDF.co Output in Zapier?](https://support.pdf.co/en/articles/11141226-where-can-i-find-the-pdf-co-output-in-zapier.md)
- [I Can't View My Output File Anymore](https://support.pdf.co/en/articles/11317597-i-can-t-view-my-output-file-anymore.md)
- [Why is my PDF.co output link not working or looks broken in my API response?](https://support.pdf.co/en/articles/11141247-why-is-my-pdf-co-output-link-not-working-or-looks-broken-in-my-api-response.md)
- [PDF.co response links are broken or not working](https://support.pdf.co/en/articles/11315959-pdf-co-response-links-are-broken-or-not-working.md)
- [PDF Form Filler - Flattening all fields in PDF form after filling out](https://support.pdf.co/en/articles/11141281-pdf-form-filler-flattening-all-fields-in-pdf-form-after-filling-out.md)
- [Semicolon \(;\) in Text Cuts Off Output \(PDF Filler Module\)](https://support.pdf.co/en/articles/11324158-semicolon-in-text-cuts-off-output-pdf-filler-module.md)
- [Unable to Fill XFA PDF Form](https://support.pdf.co/en/articles/11324183-unable-to-fill-xfa-pdf-form.md)
- [Charged for multiple pages when adding text to only one page](https://support.pdf.co/en/articles/11274803-charged-for-multiple-pages-when-adding-text-to-only-one-page.md)
- [My PDF Looks Like a Mobile View After Converting from HTML](https://support.pdf.co/en/articles/11141178-my-pdf-looks-like-a-mobile-view-after-converting-from-html.md)
- [Orientation Property Is Not Working](https://support.pdf.co/en/articles/11323473-orientation-property-is-not-working.md)
- [I Want to Fix Repeated Background-Filled Blank Pages in Screen Mode PDFs](https://support.pdf.co/en/articles/11323505-i-want-to-fix-repeated-background-filled-blank-pages-in-screen-mode-pdfs.md)
- [The footer from my HTML file isn't showing up in the converted PDF](https://support.pdf.co/en/articles/11323508-the-footer-from-my-html-file-isn-t-showing-up-in-the-converted-pdf.md)
- [Images Missing in PDF Output from URL Conversion](https://support.pdf.co/en/articles/11323512-images-missing-in-pdf-output-from-url-conversion.md)
- [HTML Looks Fine but Generates Blank Page When Converting to PDF](https://support.pdf.co/en/articles/11323693-html-looks-fine-but-generates-blank-page-when-converting-to-pdf.md)
- [Fonts Not Displayed When Importing from CDN or Linked CSS](https://support.pdf.co/en/articles/11323770-fonts-not-displayed-when-importing-from-cdn-or-linked-css.md)
- [HTML to PDF – Font \(e.g., Nunito\) or Style Not Displaying Correctly](https://support.pdf.co/en/articles/11323878-html-to-pdf-font-e-g-nunito-or-style-not-displaying-correctly.md)
- [Why Are My Base64‑Encoded Images Failing to Render in the PDF Output?](https://support.pdf.co/en/articles/12065363-why-are-my-base64-encoded-images-failing-to-render-in-the-pdf-output.md)
- [Using Built-In Helper Functions to Format Data in HTML Templates](https://support.pdf.co/en/articles/12543969-using-built-in-helper-functions-to-format-data-in-html-templates.md)
- [How to Conditionally Render a Field in an HTML Template](https://support.pdf.co/en/articles/12544075-how-to-conditionally-render-a-field-in-an-html-template.md)
- [Google Sheets to PDF – Images Missing in Output](https://support.pdf.co/en/articles/11324208-google-sheets-to-pdf-images-missing-in-output.md)
- [MSG Files Not Converting to PDF](https://support.pdf.co/en/articles/11324231-msg-files-not-converting-to-pdf.md)
- [I Want to Speed Up Barcode Reading from a PDF](https://support.pdf.co/en/articles/11324257-i-want-to-speed-up-barcode-reading-from-a-pdf.md)