Sending a Fax Abroad: Country Codes, Costs, Pitfalls

Short answer: an international fax that fails is almost never "the network". It is, in order of frequency: (1) incorrect dialling — the national trunk zero kept in, the 00 forgotten, or the country code in the wrong place; (2) an incompatible page format, your European A4 meeting an American fax machine set to Letter, which cuts off the last line of every page; (3) a time difference that makes your transmission ring in a closed office where nobody will reload the paper tray before Monday. The golden rule fits on one line: always dial the full international format 00 (or +) + country code + national number without its leading zero, send during the recipient's business hours, and keep the transmission report with the preview of the first page. For regular flows, an online fax service billed per page remains, in 2026, cheaper and far more traceable than a dedicated analogue line for international calls.

Why fax survives precisely at the international level

It's a paradox we come across every week: in a world saturated with encrypted messaging, the channel that crosses administrative borders most easily is still the fax machine.

The reason is simple. Fax relies on recommendations from the International Telecommunication Union (ITU) — the T.30, T.4 and, for the IP version, T.38 series — which have been universal for decades. A fax machine bought in Osaka speaks exactly the same protocol as a fax server installed in Lisbon. No account to create, no platform interoperability to negotiate, no corporate security policy to be signed off by two IT departments. You dial a number, the machine at the other end picks up.

The administrations and professions that still use it heavily across borders are always the same: consular services and notarial sections, law firms handling cross-border proceedings, shipping companies and customs agents, correspondent banks, hospitals and medical laboratories in countries where sharing health data by email remains legally delicate.

In other words: the international fax is not a nostalgic relic, it is a lowest common technical denominator. And like any common denominator, it works provided its syntax is scrupulously respected.

International dialling, with no room for error

This is where 80% of transmissions go astray. Take thirty seconds to write the number down correctly and you'll save yourself three attempts.

The canonical structure

The reference format is described by the ITU's E.164 recommendation. It reads from left to right:

exit prefix + country code + national number without leading zero

• From France and the European Union as a whole, the exit prefix is 00.
• From the United States and Canada, it is 011.
• From Japan, depending on the carrier, 010.
• The + sign universally replaces this prefix in web forms and address books: an online fax service will always accept +.

The recurring trap is the national trunk zero. In France, Germany, the United Kingdom and Italy (with exceptions), the number is written domestically with a leading 0 that is dropped when dialling internationally.

Note the Italian exception: Italy keeps the leading zero when dialled internationally. It is one of the few, along with a handful of special numbers, and it causes transmissions to fail every day.

Stray characters

A number copied from a website or an email signature often arrives with dots, em dashes, non-breaking spaces or parentheses around the area code. Parentheses mean "optional component when dialling domestically" — they are never dialled internationally. Clean it up: keep only the digits and the leading +.

Check before sending

Two free reflexes:

• The destination country's official numbering plan, published by its regulator (Bundesnetzagentur in Germany, Ofcom in the United Kingdom, FCC/NANPA for North America), gives the expected length of the number. If your number is two digits too long, you've kept a zero.
• The recipient organisation's official directory: embassies, court registries and hospitals almost always publish their fax number in full international format on their website. Prefer this source to a number taken from an old letter.

What an international fax actually costs you

On a conventional analogue line, a fax abroad is an international telephone call billed by duration. A standard A4 page of text occupies the line for 30 to 60 seconds depending on the speed negotiated between the two modems; a dense page in fine mode can run to 90 seconds. Multiply by an international per-minute rate, add the failed attempts — because an attempt that fails after the line has been answered is often billed anyway — and the real cost of a twenty-page file comes as a surprise.

An online fax service, by contrast, bills per page or by subscription, with a rate indexed to the destination zone. The gap widens as soon as you leave Western Europe: the same page to Germany and to West Africa does not cost the same, whatever the plan.

Three cost items that are systematically overlooked:

1. Automatic retries. Most gateways retry three to five times when the line is busy. Each partially completed attempt may be counted.
2. The cover page. It is billed as a page. On a daily three-page transmission, the cover sheet accounts for 25% of the bill. Build the header into the document rather than generating a separate cover page when it isn't required.
3. Resolution. "Fine" mode (200 × 200 dpi) roughly doubles transmission time compared with standard mode. Save it for documents containing signatures, stamps or tightly packed tables.

For organisations that still scan a lot before sending, a duplex document scanner with automatic feeder radically changes the economics of the task: it produces a clean, correctly oriented PDF directly, with no photocopier stage.

Page format: the invisible trap

The world is split between two paper standards. Europe, Africa, Asia and South America use A4 (210 × 297 mm, ISO 216 standard). The United States, Canada, Mexico and the Philippines use Letter (216 × 279 mm).

Letter is wider and shorter. The practical consequence when you send an A4 to a North American fax machine set to Letter:

• either the machine automatically shrinks the page — your small type becomes illegible at the bottom of the document;
• or it truncates the last 18 millimetres — and that is precisely where the date, the signature and the file reference sit.

The remedy is simple: when transmitting to North America, export your PDF in Letter format or, failing that, leave a bottom margin of at least 25 mm. In the other direction, a Letter received on A4 leaves a harmless white band.

The second format trap is the font. Fax digitises your page in pure black and white, with no grey tones. A thin 9-point font, a light grey, a coloured background, a faint stamp: all of it can vanish. Minimum 11 point, solid black, no colour blocks behind text.

Time zones and business hours

A fax sent at 4 p.m. from Paris arrives at 10 a.m. in New York — perfect. The same transmission to Tokyo arrives at 11 p.m., in an empty office, and it will sit in the tray until the next morning, assuming the paper holds out.

Three common-sense rules:

• Aim for the recipient's mid-morning. That's when someone physically clears the tray.
• Watch out for shifted weekends. In several Gulf countries, the weekend runs from Friday to Saturday. A Thursday evening transmission sleeps for three days.
• Anticipate local public holidays. Lunar New Year immobilises part of Asia for a whole week; August empties Southern Europe.

If you handle correspondents across several continents, a multi-time-zone wall clock above the workstation beats mental arithmetic done in a rush at 6 p.m. on a Friday. Serious online fax services also offer scheduled delayed sending: you prepare the document when you have it to hand, and the platform transmits it at the useful time.

Confidentiality and GDPR: what changes when you cross a border

This is the point that gets dealt with too quickly. Sending a document containing personal data to a recipient located outside the European Economic Area constitutes an international data transfer within the meaning of Chapter V of the GDPR. The channel used — fax, email, platform — makes no difference to that classification.

In practice, before sending a file containing named individuals outside the EEA, check:

• the existence of an adequacy decision by the European Commission for the country concerned (the United Kingdom, Switzerland, Japan, South Korea and a few others benefit from one);
• failing that, the presence of standard contractual clauses or another appropriate safeguard in your relationship with the recipient;
• or, for a one-off transmission, whether a derogation under Article 49 applies — performance of a contract, important reasons of public interest, establishment or exercise of legal claims. It is this last one that covers the bulk of transmissions to a foreign lawyer or court.

The CNIL publishes up-to-date practical guidance on these transfers; the European Data Protection Board (EDPB) sets out the methodology in detail. Fax is neither a free pass nor a handicap: it is a channel like any other, subject to the same lawfulness rules.

On top of that comes the physical risk peculiar to the fax machine: the document comes out in plain sight in a shared tray, in an office whose layout and habits you know nothing about. For any sensitive transmission, the practice is the same as domestically — announce the transmission by phone, ask for confirmation of receipt, and paginate explicitly ("page 1/7") so that a missing sheet is obvious. On the most sensitive documents, a "confidential" stamp applied at the top of the first page remains a simple, effective signal for whoever clears the tray. See also our article on securing fax use in a law practice for the organisational side.

What an international fax is worth as evidence

A frequent question, with a nuanced answer: the law of evidence is that of the forum, that is, of the court seised, not of the country you sent from.

Before a French judge, a fax transmission report is a prima facie written evidence (commencement de preuve par écrit) within the meaning of Article 1362 of the Civil Code: it makes the transmission plausible without proving it irrefutably. It has to be corroborated — a signed acknowledgement of receipt, a later exchange of emails, performance of the contract. The reasoning is developed in our analysis of the evidential value of fax before a judge.

Internationally, two further layers apply:

• Common law systems (United Kingdom, United States, Ireland) broadly admit faxed documents in evidence, subject to a statement of authenticity from the person who sent them. On this point they are often more welcoming than continental civil law.
• Cross-border procedural documents are governed by autonomous rules. In civil and commercial matters within the EU, it is the European Service Regulation that sets out the permitted channels; outside the EU, the 1965 Hague Convention. In these frameworks, fax is generally not a valid method of service. It serves to give notice, not to serve process.

The practical corollary: archive. The transmission report with the preview of the first page, the PDF sent, the timestamp — all kept in PDF/A format in a structured folder, as explained in our guide to archiving with evidential value. For firms that still keep paper reports, a lever arch file with dividers per country remains the quickest solution to consult in a hearing.

When the fax fails anyway: a five-point diagnosis

Your transmission comes back as a failure. Before retrying ten times, work through this list.

1. Immediate error, no ringing. The number is invalid or the prefix is missing. Recheck the E.164 structure.
2. Ringing then hang-up. The number belongs to a voice line, not a fax machine. Ask the recipient to confirm.
3. Connection established then cut off mid-page. Degraded line or VoIP incompatibility. Force a lower speed (9,600 bps) if your gateway allows it, and enable ECM.
4. All pages go through except the last ones. Empty paper tray at the recipient's end, or full memory. Call them back.
5. Systematic failures to an entire country. Some transit carriers compress voice in a way that is incompatible with the fax protocol. Switching online fax provider solves the problem in a day where technical troubleshooting would take weeks.

For recurring destinations that cause trouble, the only lasting solution is to check your provider's actual coverage country by country — that is the purpose of our available countries page.

Alternatives to consider before you dial

International fax isn't always the right tool. Three cases where you should give it up:

• The recipient has a submission portal. Consulates, courts and large administrations almost all have one now, with a timestamped acknowledgement far superior to a transmission report.
• The document has to be signed electronically. A qualified electronic signature within the meaning of the eIDAS Regulation retains its full legal force in the EU; put through a fax, it becomes an inert image and loses its cryptographic value.
• The volume is large. Beyond thirty pages, line time and the risk of a cut-off make fax unreasonable. An encrypted upload with a password sent through a separate channel is safer and faster.

An international administrative correspondence guide, with the customary formulas country by country, also avoids a lot of back-and-forth: half the documents rejected abroad are rejected for a missing item, not for a transmission problem.

Frequently asked questions

Do you have to drop the zero from a foreign number?

Yes, in the vast majority of countries: the leading zero is a national trunk prefix that is not dialled internationally. Italy is the exception and keeps its zero. If in doubt, compare the length of the number with the numbering plan published by the country's regulator.

Can you send a fax abroad for free?

Free offers exist, generally limited in number of pages and destinations and accompanied by an advertising cover page. They are fine for a one-off, non-sensitive transmission. For a legal or medical document, opt for a paid service that provides a usable transmission report and a clear retention policy.

How do you know the recipient received all the pages?

The transmission report shows the number of pages actually transmitted and acknowledged by the remote fax machine. Always compare it with the number of pages sent. This is also why documents should be paginated in plain sight ("3/7"): it's the only check the human recipient can carry out unaided.

Does a fax received from abroad have the same value as an original?

No. It is a copy, whose evidential weight depends on its fidelity and durability. If you need to keep the document for a long time, scan it to PDF/A immediately: the thermal paper used by some fax machines fades within a few years. Our article on reliable copies sets out the conditions.

Does the time difference affect the price?

On an analogue line, some carriers still apply off-peak rates. On an online fax service billed per page, no: the price depends solely on the destination and the number of pages.

In summary

• Always dial the full international format: 00/+, country code, number without the leading zero — except for Italy.
• Strip the number of any stray characters; check its length against the country's official numbering plan.
• Export in Letter for North America, or leave a 25 mm bottom margin to avoid truncation.
• Minimum 11 point, solid black, no coloured background: fax doesn't do greys.
• Send during local mid-morning; beware of shifted weekends and national holidays.
• Outside the EEA, any transmission of personal data is an international transfer subject to Chapter V of the GDPR.
• The transmission report remains prima facie written evidence: corroborate it and archive it in PDF/A.
• A fax never amounts to service of process: for that, use the European Regulation or the Hague Convention.