For a publicly readable PDF, build a virtual-hosted S3 object URL from the bucket name, AWS Region and exact object key. It works only if effective permissions allow anonymous s3:GetObject. For a private PDF, generate a GET presigned URL; it grants time-limited access without making the bucket public. If you need HTTPS delivery with caching or tighter control, use CloudFront in front of S3.
Choose the right kind of S3 PDF link
“Direct URL” can mean a stable address anyone can open, or a link that directly downloads a private file for an authorized recipient. Those are different access models. A URL does not itself grant access: S3 evaluates the request against the object, bucket and account settings.
| Option | Who can retrieve it | How long it works | Best fit | Main trade-off |
|---|---|---|---|---|
| Public REST object URL | Anyone, if anonymous s3:GetObject is allowed |
Until the object or effective permissions change | Public PDFs and static assets | Anyone with the URL can read it; public-access controls must allow this |
| Presigned GET URL | Anyone holding the valid signed URL | Until expiry or the signing credentials stop being valid | Private, expiring or user-specific access | It expires and must be generated again |
| S3 website endpoint | Public website content only | Until website or object permissions change | Simple static websites | HTTP only; content must be publicly readable |
| CloudFront in front of S3 | As allowed by the distribution and any signing policy | According to distribution and signing configuration | HTTPS delivery, caching or controlled distribution | Requires CloudFront configuration |
AWS says S3 objects are private by default and presigned URLs grant time-limited access without changing the bucket policy (sharing objects with presigned URLs; downloading and uploading with presigned URLs). Choose public access only when the file is meant to be public; a hard-to-guess URL is not a substitute for access control.
Build a public direct URL
1. Find the bucket, Region and exact key
For example, if the bucket is company-public-files, its Region is us-east-1, and the object key is docs/guide.pdf, the virtual-hosted URL is:
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https://company-public-files.s3.us-east-1.amazonaws.com/docs/guide.pdf
The key includes every prefix and capitalization exactly. S3 keys are case-sensitive: Docs/Guide.pdf and docs/guide.pdf are different keys. Encode special characters in the key for a URL. Preserve path separators between key components; encode characters such as spaces as needed.
2. Use the virtual-hosted endpoint
The current preferred REST form is https://BUCKET.s3.REGION.amazonaws.com/KEY. AWS also documents path-style URLs, but virtual-hosted style is the recommended current pattern. Make sure the Region in the hostname is the bucket’s actual Region; the bucket name alone is not enough to guarantee a working address.
3. Allow anonymous object reads only if intended
The public URL works only if the effective bucket and account configuration permits anonymous s3:GetObject for that object. Newly created S3 buckets have all four Block Public Access settings enabled by default, according to AWS documentation current as accessed in 2026. As a result, copying an object URL does not make the PDF public. Review the intended exposure and the relevant S3 Block Public Access and bucket policy settings before enabling public access.
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Generate a private PDF link
For a private object, create a presigned URL for the GetObject operation. Anyone who has the resulting URL can use it while its signature and credentials remain valid, so treat the URL like a temporary bearer credential. AWS describes presigned URLs as a way to give time-limited access without updating the bucket policy.
From the S3 console
- Open the S3 console and navigate to the bucket and PDF object.
- Select the object and choose the console action to share it with a presigned URL.
- Set an expiration appropriate for the recipient, then generate and copy the URL.
- Test the exact copied URL in a browser or with
curlbefore sending it.
Console-generated presigned URLs can be set for up to 12 hours, according to AWS documentation current as accessed in 2026.
With the AWS CLI
For a URL valid for seven days at most, use:
aws s3 presign s3://company-private-files/docs/guide.pdf --expires-in 604800
Replace the bucket and key with the exact object location. The CLI must be configured with AWS credentials that can retrieve the object. The resulting URL can be opened in a browser or requested with curl. AWS CLI and SDK presigned URLs can be configured for up to seven days, but temporary credentials can make them expire sooner.
Expiration is bounded by credentials
A requested expiry is not a guarantee that the link remains usable for that full period. The URL stops working when its signing credentials expire or are revoked, even if its configured expiry is later. Console links have a lower documented maximum than CLI or SDK links; use a short duration for one-time sharing and regenerate the URL when legitimate access is needed again.
Make the browser display or download the PDF
First check the object’s metadata: its content type should be application/pdf. Whether the browser displays or downloads the file can also depend on the response’s Content-Disposition and the browser’s behavior. A signed GetObject request can override response-content-type and response-content-disposition; those overrides must be included in the signed request or presigned URL. For a public object, metadata must be set appropriately on the object because an unsigned URL cannot authorize a signed response override.
Use an inline disposition when the intent is to ask the browser to render the PDF, and an attachment disposition when the intent is to download it. Browser settings, extensions and PDF support can still affect the result.
Use a website endpoint or CloudFront when appropriate
S3 website endpoint
An S3 website endpoint is for publicly readable website content, not a private-object sharing mechanism. AWS states that website endpoints do not support HTTPS or access points. If HTTPS is required, or you need stronger delivery controls, AWS recommends putting CloudFront in front of S3 (S3 website endpoints).
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CloudFront distribution
CloudFront is a better fit when you want HTTPS, CDN caching or distribution-level access controls. It adds setup beyond copying an S3 object URL; configure the distribution and its access or signing policy for your use case. Prefer a stable public URL or distribution address for content that should be broadly available; prefer a presigned S3 URL when the object should remain private and access should expire.
Troubleshoot a URL that fails
403 Forbidden or AccessDenied
- For a public URL, confirm that effective bucket and account settings permit anonymous
s3:GetObject; a URL alone never grants public access. - For a presigned URL, confirm the signing identity has permission to read the object and that the URL has not expired or lost validity with its credentials.
- Use the exact URL produced by the console, CLI or SDK. Do not remove or alter its query parameters; they carry the signature.
- Verify the bucket Region and exact key, including capitalization and prefixes.
Signature mismatch or request rejected
- Use the exact generated URL, including its full query string.
- Check that the signing machine’s clock is synchronized.
- If the request signed a
Content-Typeheader, send the same value in the request. - Regenerate the URL if credentials have expired or the signature parameters were changed.
The link opens the wrong object or reports not found
- Compare the key character by character with the object key shown in S3.
- Check encoding for spaces and other special characters; do not change letter case.
- Ensure the hostname names the correct bucket and Region.
The PDF downloads when you expect it to open
- Check that the object’s content type is
application/pdf. - Check
Content-Dispositionmetadata or the signed response override; use an inline disposition for browser display intent. - Try a browser that supports PDF viewing and check its PDF handling settings.
Reliability, security and cost considerations
A public URL is stable only while the object remains at that key and permissions continue to allow anonymous reads. A presigned link is intentionally temporary and must be regenerated after expiration; it is not suitable as a permanent URL embedded in documentation or long-lived pages. For either type, the object key and Region must be correct.
Use the least exposure that fits the job. Public access is appropriate for intentionally public documents. For private documents, avoid publishing presigned URLs in public pages, logs or places where unintended readers can copy them. Expiration limits exposure but does not make a leaked, unexpired link private again. CloudFront can supply HTTPS and caching, but its protection depends on how the distribution and signing policy are configured.
S3 charges are not specified here; check AWS pricing for the services and Region you use before estimating delivery costs. The choice among public S3, presigned S3 and CloudFront changes access and delivery behavior, not the need to consider storage and request or transfer charges.
Or skip the browser setup
If what you need is a screenshot of a PDF page or another webpage—not a shareable S3 PDF link—ScreenshotNeo can return an image or PDF with one GET request. For an S3 URL, use a URL that the service can access, such as a public object URL or a valid presigned URL.
cURL:
curl -G "https://api.screenshotneo.com/v1/shot" -d access_key=YOUR_API_KEY --data-urlencode url=https://company-public-files.s3.us-east-1.amazonaws.com/docs/guide.pdf -o shot.webp
Python:
import requests
r = requests.get("https://api.screenshotneo.com/v1/shot", params={"access_key": "YOUR_API_KEY", "url": "https://company-public-files.s3.us-east-1.amazonaws.com/docs/guide.pdf"}, timeout=90)
open("shot.webp", "wb").write(r.content)
Node.js:
const q = new URLSearchParams({ access_key: 'YOUR_API_KEY', url: 'https://company-public-files.s3.us-east-1.amazonaws.com/docs/guide.pdf' });
const res = await fetch(`https://api.screenshotneo.com/v1/shot?${q}`);
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FAQ
Can I use the URL of an S3 PDF as a permanent link?
Yes, if you keep the object at the same key and its public access remains enabled. A presigned URL is not permanent because it expires.
Does an S3 website endpoint provide HTTPS?
No. AWS states S3 website endpoints do not support HTTPS; use CloudFront when HTTPS delivery is required.
Can anyone use my presigned URL?
Anyone holding a valid presigned URL can use it until the URL expires or its signing credentials become invalid. Avoid exposing it as if it were a private account login.
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